METAL-FACH Heating Technology

Maintenance services

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Service department

Do you have a question about your central heating boiler?

Central heating boiler service

(General contact)
Monday-Friday (7:00 a.m. – 3:00 p.m.)


+48 85 711 94 56 ext. 17



Tutorial videos

Check what we’re talking about on our YouTube channel!

In order to meet the expectations of customers and installers who assemble our central heating boilers, we create instructional materials on our YouTube channel, developed by our experienced service technicians. The subject of the films concerns the assembly and operation of boilers. Under each of the films, you can ask questions about a specific topic, our specialists will try to dispel any doubts and answer questions. We want our clients and installers to have an impact on the further development of the channel, therefore you can also post ideas / suggestions for topics for further films in the comments. We will be happy to consider each of them.

FAQ – Frequently Asked Questions

Driver related question

What does the alarm mean - faulty exhaust gas sensor?

A faulty flue gas sensor indicates that the flue gas temperature has exceeded 250 ° C. The exhaust gas temperature sensor is damaged.


Reduce fuel supply. Replace the exhaust gas temperature sensor.

What does the alarm mean - clean the boiler?

Clean the boiler means that the boiler exchanger is dirty. Flue gas temperature higher than 220 ° C.


Clean the boiler exchanger. Reduce fuel supply

What does the alarm mean - mixer overheated?

An overheated mixer means that the temperature downstream of the mixing valve is higher than 70 ° C.


Reduce the temperature at the valve.

What does the alarm mean - boiler overheated?

Overheated boiler, temperature greater than 90 ° C.
Too short holding time.


Cool the boiler. Extend the standstill time.

What does the alarm - overheated feeder mean?

An overheated feeder can mean:
– the fuel bin hatch is open
– damaged seal under the hopper flap
– damaged seal under the charging hopper
– damaged seal of the feeder cleanout
– damaged gasket between the burner and the feeder pipe
– loose screws on the connections of the basket with the feeder and burner


– close the fuel hopper hatch
– replace the seal under the hopper flap
– replace the seal with the charging hopper
– replace the gasket
– replace the gasket
– tighten all screws

What does the alarm mean - too high exhaust gas temperature?

Indicates that the boiler exchanger may be dirty. Flue gas temperature higher than 280 ° C.


Clean the boiler exchanger. Reduce fuel supply.

What is an anti-blockade?

Anti-blocking is a function that works with pellets.


It serves to keep the heat in the furnace. When the boiler turns off, it reaches the set temperature every 20 minutes, if the temperature does not drop, the anti-blocking function will be activated for 5-10 seconds. The anti-blockage can be set freely according to the needs and power of the boiler. Normally it is 5 seconds.

What is the domestic hot water (DHW) priority?

Domestic hot water priority is a function in the controller that first heats the domestic hot water tank, and then turns on the central heating.


Function normally used in places with very high domestic water consumption.

What operating modes does the PLATINUM controller have?

The PLATINUM controller has three operating modes.


Summer – that is, heating only domestic hot water.
Manual – that is heating the central tap water and central heating. In the operating mode, the preset temperature must be set on the boiler and on the heating circuit.
Weather – that is, heating the central tap water and central heating. In this mode, it is the weather station that calculates the set temperature for the boiler and the heating circuit.

What activities does the microprocessor controller perform?

It carries out:
– automatic ignition and extinguishing
– weather controls
– room control (room temperature)
– control of the central utility water pump
– clock control: circulation pump, additional pump, burner (boiler operation time)
– control by means of the LAMBDA PROBE

What is domestic hot water (DHW) disinfection?

Domestic hot water disinfection is a function in the controller that heats the domestic hot water tank to a temperature of 70 ° C in order to disinfect it.


A function to kill the Lagionelia bacteria in the central tap water circuit. Normally it is rarely used. If the temperature in the tank is kept at 50 ° C, such bacteria will not breed. The probability of bacteria occurrence is when we keep the temperature in the tank low or when we rarely open the water taps.

What is a heat curve?

The heating curve is a graph of external temperatures to the temperature of the central heating water. The heating curve is a calculated heating temperature in relation to the outdoor temperature.


The heating curve diagram is included in the controller manual.

How is the boiler protected against freezing?

The boiler protects against freezing by the controller’s program, which prevents this from happening.


At a temperature below 8 ° C, the controller opens the mixing valve and turns on the central heating pump in order to prevent the water from freezing in the system. Additionally, all pipes particularly exposed to heat loss should be protected with additional insulation. Check that there are no broken windows, open windows, holes in the walls, etc. near the pipes.

Alarms and prompts - displayed as AL and IN in the x40 thermostat
Signs of alarms differ depending on the type of controller the boiler is equipped with. The codes for both versions of the driver are shown below:

Platinum (version of the driver dedicated to eco peas)
1. Damage to the exhaust gas sensor
2. Boiler temperature exceeded
3. The feeder temperature exceeded
4. Damaged boiler sensor
5. Damaged feeder sensor
6. Unsuccessful firing up
7. Exhaust gas temperature exceeded
8. Damaged STB circuit
9. Poor fuel
10. Fuel delivery system damaged
11. Faulty fan
12. Faulty flow meter

Platinum Pellet (pellet-dedicated driver version)
1. Boiler temperature exceeded
2. The feeder temperature is exceeded
3. Damaged boiler sensor
4. Damaged feeder sensor
5. Unsuccessful firing up
6. Exhaust gas temperature exceeded
7. Damaged STB circuit
8. Poor fuel
9. Faulty fuel delivery system
10. Damaged fan
11. Flow meter defective

Prompts common to both versions:
1. Low fuel level
2. Unsuccessful loading of the tank (from an external tank)
3. Lack of fuel
4. Lambda probe calibration is in progress
5. Lambda probe calibration failed
6. Loss of flame
7. Faulty fuel delivery system
8. Boiler door open

Installation question

Is a 4-way valve required?

Yes, a 4-way valve is required.


A four-way valve is a device with many useful functions, including:
– protects the boiler against low-temperature corrosion
– mixing the feed water back in order to obtain a constant medium for the central heating circuit or underfloor heating
– enables smooth temperature control by means of an actuator
– valve assembly gives additional fuel savings
– above all, it protects our boiler against corrosion and extends the life of the boiler

What to do when we boil water in the boiler?

Don’t panic. Usually, when we boil water in the boiler, nothing serious should happen. The reason for the boiler to boil is the lack of heat reception, open ash-pan door, placing easily flammable fuel, e.g. newspapers.


In such a case, the controller turns on all pumps above the temperature of 90 ° C, even if they are turned off, and opens the mixing valve to cool the boiler down.
If the door is open, close it. If it is an upper combustion boiler, you can open the top door in order to cool the boiler faster.
It is absolutely forbidden to allow cold water into the installation – it may cause the boiler to explode.

What is the minimum temperature of the boiler?

The higher the better, but the minimum boiler temperature should not be lower than 60 ° C.


The boiler should be adjusted in such a way that at the boiler temperature of 60oC, the flue gases are approx. 140 ° C.
We will have the best boiler efficiency.
All combustion conditions will be maintained.
At such temperatures, the boiler will not freeze, it will not get wet due to the lack of flue gas condensation (dew point temperature).

Why is the central heating pump not working?

DHW priority is enabled. Schedule is attached.


In order to eliminate the problem, turn off the DHW priority and set the schedule.

Is it allowed to admit water to the system while the boiler is in operation?

It is forbidden to allow water to enter the system while the boiler is in operation.


Supplying water to the hot boiler may cause the boiler and installation to become unsealed.
When the boiler is very hot, it may lead to leakage or cracks.

What is the minimum return temperature?

As a book, the minimum return temperature is 10 ° C less than the flow temperature.


In practice, it is practically impossible without the use of mixing valves or other methods of mixing the boiler.
It is advisable to install a four-way valve, with such an installation, the boiler operates on a short circuit at high temperature, and the installation at any set temperature.
The return protection at this temperature is maintained and it can be said that it is equal to the boiler flow temperature.

Why does the controller close the mixing valve?

Too low return temperature, allow the boiler to slowly allow water into the central heating system, in the case of a long-term condition, place the return sensor closer to the mixing valve or change the minimum return temperature.

Problems with the central heating boiler

Why does unburned pellet fall into the ash pan?

Unburned pellets fall into the ash pan because the pellet feed is set too high or the airflow is too high.


Reduce the feeding by 2-3% and observe, if necessary, repeat the operation.
Reduce airflow by 2-3% and repeat the operation, if necessary.

Why does unburnt eco-pea fall into the ash pan?

Unburned eco-pea coal falls into the ash pan because the feeding of eco-pea coal is set too high.


Reduce the feed by 2-3% and watch for improvement.

What can you smoke in boilers with a gutter feeder?

Pellets can be used to burn in boilers with a gutter feeder.


Pellets with a granulation of Φ 6-8 mm

Why is the burner baking?

Sintering on the burner is formed when the air supply is set too high.


Reduce the blower power.

Why is fuel combustion bad in boilers with an automatic feeder?

Bad fuel combustion in boilers with an automatic feeder results from wrong selection of feeding times. The blower settings are wrong.


Adjust fuel delivery and / or blower (see settings table). Call the service.

In the retort burner, the fuel burns only from one side of the furnace?

In the retort burner, the fuel burns only on one side of the furnace due to the dirty air chamber of the burner. There is no seal under the retort flange or the fan is dirty.


Clean the burner air chamber. Fit the packing cord. Clean the fan.

What is the cause of a split pin breaking?

The reason for breaking the split pin is the fuel granulation inconsistent with the manufacturer’s recommendations, (a lot of stones in eco-pea coal or a lot of sawdust in the pellets), wet fuel, sinter on the burner.


Replace eco-pea coal.
Sift eco-pea coal, replace.
Replace the pellets.
Dry the fuel.
Clean the burner.

Why is the feeder engine running and not feeding fuel?

The feeder engine is running, but it does not feed fuel because the split pin is broken or the feeder screw is worn.


Replace the split pin. Replace the feeder auger.

Why is the blower not working?

The blower does not work because the plug may be unplugged. The boiler was overheated, the STB protection was activated.


Insert the plug from the blower into the socket. After the boiler has cooled down, press the STB button.

Why does the feeder motor get hot?

The feeder motor heats up due to the used capacitor.


Replace the capacitor.

Why is the feeder not working and why is the engine humming?

The feeder does not work and the engine hums because it is probably blocked, but the pin has not been broken. The motor capacitor may also be worn out.


Open the cleanout window, remove the “foreign body”, eg a stone. Replace the motor capacitor.

What happens when the feeder temperature is exceeded?

In order to avoid flashback, the controller activates the feeder in order to push the fuel out of the feeder pipe.

What is the maximum feeder temperature?

The maximum feeder temperature is 80 ° C.

Why is there water leakage from convection channels?

Fuel is burned too quickly due to:
– too large chimney cross-section
– too much air supply
– wrong driver settings


Close the throttle on the flue. Check the door tightness. Adjust the air supply. Adjust the controller or call the service.

Why is the boiler "sweating" during the first start-ups?

During the first start-ups, the boiler “sweats” as condensation occurs.


Fire up the boiler to the temperature of about 80oC and keep it for at least 6 hours. When there is a need, we repeat this action.

How long will a full tank of fuel last?

There is no definite answer to this question. It can be assumed that a full tank of fuel will last for 3-4 days.


The burning behavior of the boiler depends on:
– calorific value of fuel
– the degree of thermal insulation of the building
– type of installation: underfloor heating, radiators, boiler
– cleanliness in the boiler exchanger, ash content in the ash pan
– outside temperature
– house temperatures
– combustion quality

Why is smoke coming out of the boiler door?

Smoke comes out of the boiler door due to lack of draft.


Wall tightly the entrance of the flue to the chimney. Check the chimney patency and its parameters, if they comply with the recommendations.
Seal the outlet of the stove to the chimney, preventing the intake of cold air. If the chimney cross-section is too small, an exhaust fan can be installed.

Why is there a grease in the boiler?

There are a few cases where the boiler is greasy, e.g. wet fuel, bad combustion conditions, oversized boiler, low boiler temperature.


Seal the entrance to the chimney tightly.
In the first case, the moist fuel produces too low exhaust gas temperature and thus exhaust gas condensation. In this case, not only is the boiler greasy, but also the chimney.
In the latter case, most often there is simply not enough air in the combustion chamber. Just add some air and a flame, the gases will burn freely without precipitating carbon from the exhaust.
In the case of an oversized boiler, the temperature is obtained very quickly and therefore the boiler will be at standstill more often than not in operation. As a result, the gases in the flue gases will not burn out, i.e. the boiler will become greasy.
Too low boiler temperature is the worst error. If the boiler is incorrectly connected to the installation, it is the thermostat in the house, i.e. to reduce the temperature in the house, you need to lower the boiler temperature. In this case it is recommended to install mixing valves.

Burner problem

The burner does not turn on

– no power or the boiler controller is turned off
– the fuse of the gearmotor has blown
– the overload relay has tripped
– the motor thermal switch has tripped


– check the power supply and the main switch of the electronic controller
– check and replace if necessary
– reset the overload relay
– check the switch and find out the cause of its activation

The feeder screw in the burner does not rotate despite the gearmotor operation

– the fuse of the gearmotor has blown
– the clutch of the worm and the gear motor is disengaged
– uncleaned screw before the end of the boiler operation


– check and replace if necessary
– replace the clutch insert and reattach the clutch
– remove the auger, clean it, notify the manufacturer

There is smoke from the hopper

There is a leak in the entire system.


Check if the feeder flap is properly closed. Check seals and screws of the feeder with the burner, if necessary, tighten any loose elements.

The auger is empty (no fuel)

– the overload relay has tripped
– no fuel in the hopper or fuel has hung over the feeder
– the clutch of the worm and the gear motor is disengaged


– reset the overload relay
– check the fuel level in the container and above the fuel pickup openings
– replace the clutch insert and reattach the clutch

There is frequent shearing of the wedge securing the worm

– gearmotor bracket unstably attached to the ground
– wrong centering of the gearmotor bracket in relation to the worm


– improve and ensure permanent fixation
– check alignment of assembly and center if necessary

Burnt end of a snail in the retort

Incorrect combustion regulation.


Adjust the correct combustion in the boiler in accordance with the boiler manual.

The burner does not ignite the fuel

– no fuel – check the tank and the feeder for clogging
– too low starting dose – check the starting dose
– damaged igniter – check the heater
– damaged drive motor – check the motor thermal

Photosensor check

The photosensors in the burner should be cleaned periodically with a damp, soft cloth. To do this, disassemble the housing by loosening four mushroom head screws in REVO Mini – REVO Mini35 models, and three bolts in models from REVO 44 to REVO 150. Then remove the photosensor from the socket, clean it and reinstall it. After performing the above steps, reassemble the burner housing in reverse order.
Photosensor cleaning frequency: boiler rooms every 3 months
Measurement reading in the dark 0-5 units, in full light 100 units.

Damage to the feeder sensor - the alarm cannot be canceled

The most common cause of a defect is the destruction of the thermoprotection of the sensor, which in turn leads to overheating of the measuring element. If, despite the burner cooling down, the fault cannot be canceled, the measuring sensor must be replaced. In order to verify whether the sensor is definitely damaged, measure its resistance, which should be between 1-5 Ω. The resistance of a damaged sensor is about 100 kΩ.

Blower defective

– blockage of the blower blades – unscrew the blower cover screws and check whether they are not mechanically blocked
– check the voltage on the blower wires
– check the blower motor capacitor

The preset boiler temperature on the display is different than the programmed one.

– if the DHW tank is not being loaded at this time and the preset DHW temperature has been set above the preset boiler temperature, if so, then the difference in indications will disappear after heating the DHW tank or reduce the preset DHW temperature
– whether the time periods are turned on – turn off the time periods

Additional feeder does not work (module B)

– check that the feeder wires are properly connected to the terminals
– check if the jumper is on terminals 1-2 of the B module
– check whether the feeder motor is not damaged
– if you can hear the engine running and the fuel is not fed, check the feeder in accordance with the feeder’s manual

The fuel is not burnt, there are unburned fuel particles in the ash. Fuel burns with a lot of smoke, the burner goes out

Check the power modulation settings in menu → boiler settings → power modulation.

In the DHW = SUMMER mode, the radiators are hot and the boiler overheats.

Increase the value of the parameter Extend HUW pump operation time in order to cool down the boiler.

In a hydraulic system with a mixing valve and an actuator - the mixer does not open.

The reason may be loading the HUW container with activated HUW priority. Wait until HUW is loaded or disable HUW priority.
The reason may be that the SUMMER function is active.
The reason may be activation of the return protection function (menu → service settings → boiler settings → return protection). If the return protection function is enabled – check that the boiler water return sensor is thermally insulated from the environment. Improve the thermal contact of the sensor with the pipe by applying thermal paste. Increase the preset boiler temperature in order to provide a power reserve for heating return water. Check if the hydraulic system is properly made, i.e. after closing the valve, the return temperature must rise above the value of the Min. Return temperature parameter.
The reason may be the ongoing calibration of the mixer valve, wait until the calibration is completed. Active calibration is marked with the word “CAL” in the INFORMATION menu.

Burner fires but does not go to first power

– too high starting dose – check the starting dose
– dirty or faulty photosensor – clean or replace photosensor,
– faulty external thermostat in oil boilers or baking ovens

Internal tray overheating.

– burner dirty with trail
– low chimney draft – use a fume extractor

The display shows no signs of operation of the device, despite being connected to the mains

– whether the mains fuses are blown and replace if necessary
– whether the cable connecting the panel with the executive module is properly connected and whether it is not damaged

Clogging of the feeder

The internal feeder is designed to evenly mix and feed fuel. The reason for the clogging of the internal feeder may be:
– wrong setting of the internal feeder in relation to the external feeder – increase the working time of the internal feeder (service menu / burner feeder)
– damage to the gear motor – replacement of the gear motor
– incorrectly selected feeder operation interval – the value should not exceed 20s. (service menu / burner interval)

The central heating pump is not working

– whether the boiler exceeded the temperature above the central heating pump activation temperature parameter – wait or reduce the value of this parameter
– whether the DHW priority that blocks the CH pump is enabled – disable the priority by setting the DHW pump operation mode to No priority
– whether the central heating pump is damaged or blocked

The fan is not working

Check if the safety temperature limiter STB input jumper is on terminals 1-2, (the jumper should be installed only if the temperature limiter is not connected).
If the boiler manufacturer has equipped the boiler with an STB temperature limiter with manual return to the starting position, it should be unlocked by unscrewing the cover and pressing the button according to the manufacturer’s documentation.
Check the fan and replace if necessary.

The fuel feeder does not work / does not feed

– check that the feeder wires are properly connected to the terminals
– if the STB temperature limiter is connected to terminals 1-2, check whether the circuit has not been cut off due to boiler overheating
– check whether the feeder motor is not damaged
– if you can hear the engine running and the fuel is not fed, check the feeder in accordance with the boiler manual

Temperature is not being measured correctly

– check if there is good thermal contact between the temperature sensor and the measured surface
– that the sensor cable does not run too close to the network cable
– whether the sensor is connected to the terminal
– if the sensor is not damaged – check it

The DHW pump works even if the DHW tank has already been filled

Set the parameter Extending HUW pump operation time = 0

Off-offer boilers older than 2019

What is the maximum number of pumps that can be connected to one controller output in the SILVER and GOLD regulator?

The maximum output load is 80-100W, so one.

How is the fuel to the burner manually fed - SILVER or GOLD controller?

Turn the boiler off in the OFF mode, then enter the CONNECTIONS TEST and start the feeder until fuel appears in the burner. (MENU – CONNECTION TEST – Tray – ON)

How to check the correct connection of the pumps?

Turn the boiler off in the OFF mode, then enter the CONNECTIONS TEST and start individual pumps.
HUW pump – On
Pump P3 – On
Circulation – On

What happens if the boiler overheats?

In order to discharge water quickly, the controller will start all the pumps and open the mixing valve to the maximum, in the case of higher temperatures, the STB protection will be activated, which will mechanically disconnect the fan / feeder.

Why is the fan / feeder not working despite the operation indication on the display?

– the STB protection has been activated (wait for the boiler temperature to drop and press the white safety button)
– the power plug has been disconnected from the socket
– if the feeder is equipped with a reverse, the switch position is set to 0
– the starting capacitor of the feeder / fan has been damaged (replacement required)

What fuses are mounted to the boiler?

6.3 A glass fuse.

Where should the mixer sensor ½ be placed?

The mixer sensor should be placed behind the mixing valve, behind the pump.

What are the automatic operation modes?

There are operating modes in the SILVER controller:
S – firing up
N – normal operation
P – sustain
D – afterburning / blanking

There are operating modes in the GOLD controller:
Putting out

What should the boiler hysteresis be?

The boiler hysteresis should be set in the range 1-5.

How do I turn on weather control?

In order for the boiler to work on the basis of the weather, it is necessary to:
– in the boiler MENU, select the operating mode: Weather (menu-> boiler-> weather mode)
– in the CO / CO1 / CO2 menu, set the heating curve in accordance with our preferences (menu-> co-> heating curve)

What room regulator does the controller support?

The controller supports every traditional two-wire room thermostat, make-break.

Which contacts should be selected on the room thermostat?

In the SILVER controller:
For FL310: NC and COM
For FL310A and FL310 (present in the SMART boiler): NO and COM
In the GOLD controller: NO and COM

How does a room thermostat work?

If there is a mixing valve with an actuator in the hydraulic system, the room thermostat, when it detects that the preset temperature in the room has been reached, will lower the central heating circuit temperature by the value selected in MENU → CH → Reducing the room regulator.
In the absence of a valve with an actuator, the room thermostat will switch off the central heating pump when it detects that the set temperature has been reached. In such a case, in MENU → Co → Mixer actuator must be selected as NO.

What should be the relationship between the boiler temperature and the central heating and hot water temperature?

It is recommended to keep at least a 15-degree difference between the preset boiler temperature and the central heating and hot water temperature.

What is the difference between the eco-pea coal program and pellets?

In the case of the eco-pea coal program, the controller performs the support function. In the case of the pellet program, the support is skipped.

Why can't I change the anti-blocking value?

The eco-pea program is selected. This function is only for pellets, it does not work with eco-pea coal.

How can I increase fuel feeding?

SILVER driver:
The parameter determining the amount of fuel supplied in the combustion process is the parameter feeding 100%
Menu → Burner
In the case of feeding too little fuel, this time should be extended.

GOLD controller:
The parameter determining the amount of fuel supplied in the combustion process is the parameter feeding in the cycle
Menu → Burner
In case of feeding too little fuel, the percentage of feeding in the cycle should be increased

How is cycle administration understood?

It determines how much time the feeder feeds fuel in the parameter: feeder cycle.
– feeder cycle 20.0 s
– feeding in a 20% cycle
– actual feeding = 20 * 0.2 = 4 seconds of feeder operation

What to do in case of not burning eco-pea coal?
You should:

– clean the ventilation channel under the burner crown
– if there is no improvement, increase the airflow power (menu-> dm settings in all powers should be increased by 2%)

What to do in case of pellet failure?


If we find unburnt pellets in the ash pan, reduce the airflow power / fuel supply.
To do this, we follow the steps:
– MENU-  burner feeding 100% – reduce by 0.2s
– MENU – settings reduce in all powers by 2%

Why does the boiler ignite, but not enter the operating mode?

The boiler controller decides that the firing-up attempt has been successful if the flue gas sensor detects a temperature 5 degrees higher than the boiler temperature. If, despite firing up the furnace, the boiler still tries to fire up, it is necessary to:
– check if the flue gas sensor is in the flue
– check the fumes sensor for contamination, in case of contamination, the sensor should be mechanically removed
– clean the boiler
– if the boiler is equipped with draft swirlers, remove one of them

Why is there a knocking on water grates in charging boilers?

– knocking on the water grates in charging boilers means that the boiler is not properly leveled
– local boiling of water on grates
– no water circulation


– level the boiler
– check the water circuit
– check whether the pump is working

Keep the ON / OFF button pressed for 3 seconds.

Keep the ON / OFF button pressed for 3 seconds.

How to manually check the correct connection and operation of the mixing valve actuator?

Turn off the boiler to the OFF mode, then enter the CONNECTIONS TEST and check the valve opening and closing direction, wrong connection will result in no rotation.
Mixer Off – On

What is the alarm temperature of the boiler?

The alarm temperature of the boiler is 90 ° C.

Where is the STB sensor located?

The STB sensor is located under the black cap on the right side of the display.

Why does the controller not start after turning the rocker switch to position I?

If, after setting the switch to position I, the switch starts to light, check the fuse and the fuse socket under the switch.

Where should the CO sensor be placed?

The CO sensor should be placed after the CO pump.

Where is the lambda probe located?

The lambda probe is located in the boiler flue, it is connected with 4 wires in a black sheath. If it is missing, the probe socket is closed with a rubber plug.

What do the question marks mean when the temperatures are displayed?

The controller does not “see” the sensor, it is caused by:
– damage to the sensor (replacement required)
– disconnection of the cube (to check, unscrew the cover above the controller and check if the cube is connected to the controller)

How to change the minimum return temperature?

Activate the advanced settings, then go to the measurements in the controller and change the minimum return temperature at the very bottom. It is not recommended to set the temperature lower than 30 ° C.

How to allow more hot water into the CO cycle?

If you have a manually operated mixing valve, set the knob on a higher scale. If you have a mixer actuator:
In the SILVER controller – in the CO menu it is possible to change the target temperature
In the GOLD controller – in the CO1 / CO2 menu, change the target temperature

How and where to connect the room thermostat?

In the case of a boiler model with a socket outlet from the rear, the thermostat is connected to the socket. In the case of the model without terminals for connection, unscrew the service cover and connect the thermostat wires directly to the controller strip.
In the SILVER controller: The cables should be connected to the Reg.Pok and GND sockets to the controller module
In the GOLD controller: The cables should be connected to the REG.POK1 / REG.POK2 and GND sockets to the controller module.

Why does the room thermostat work the other way around?

Wrong contacts have been selected in the thermostat. In this case, replace NO → NC / NC → NO
If the thermostat does not allow the contacts to be changed, the operating mode should be changed from heating to cooling. See also room controller manual)

What temperature and hysteresis should be set on DHW?

In most cases, the DHW temperature is 45 and the hysteresis is 5. These values can be freely modified by the user.

How do I start smoking on the grill?

We change the settings:
Menu → Burner → Fuel → Grate
And then we start the boiler in automatic mode. It is forbidden to open the ash pan door in order to create a draft. The air for the combustion process is supplied by a fan.

Why can't I change the values of sustain, feed / stop and blower rundown?

The pellet program is selected. This function is only for eco-pest, it does not work with pellets.

What is a feeder cycle?

The feeder cycle applies to the GOLD controller. The feeder cycle determines the feeder operation time and its standstill time.

Why are "rocks" formed when burning pellets?

This is due to poor fuel quality.

What should the ignition times be?

SILVER driver:
For eco-pea coal:
Ignition – 0 min
Blower + igniter 6 min
Fire test 4 min
For pellets:
Ignition – 0 min
Blower + igniter 4min
Fire test 2 min

GOLD controller:
For eco-pea coal:
Ignition – 6 min
Fire test – 4 min
For pellets:
Ignition – 4 min
Fire test – 2 min

How much should the initial application be?

Initial pass should be 25 seconds.

What can you smoke in boilers with a gutter feeder?

It is possible to burn in boilers with a gutter feeder with different fuels thanks to three modes of operation.


The first – eco peas
The second – pellets, in this program you can burn pellets, grains, pits, fine wood chips and everything that is small granulation.
Third – grate, in this program we use wood and coal.
Of course, if we smoke with eco-pea coal or pellets, we can also burn on the upper grate, adding some wood or coal.

General contact:

Opening hours:

  • Mon.-Fri. 7:00a.m.-3:00p.m.
  • Phone: +48 85 711 94 54 int. 17
  • E-mail: p.czepiel@metalfach.com.pl

General contact:

Service contact:

Opening hours:

  • Mon.-Fri. 7:00a.m.–3:00 p.m.
  • Phone: +48 85 711 94 54 int. 17
  • E-mail: p.czepiel@metalfach.com.pl

Address data:

METAL-FACH Technika Grzewcza
Sp. z o.o.

  • st. Sikorskiego 66, 16-100 Sokółka, Poland
  • NIP: 545-182-60-12
  • REGON: 523566030

How to get: