What are Combi Fault Codes?

Baymak HT Condensing Fault Codes
10E Fault Code: Outdoor temperature sensor malfunction
20E Error Code: Central heating circuit NTC sensor malfunction
Replace the heater NTC.
28E Fault Code: Chimney NTC sensor failure
Replace safety NTC.
50E Fault Code: Domestic water circuit NTC sensor failure
Replace the hot water NTC.
60E Fault Code: Room thermostat sensor failure
Replace the room thermostat.
62E Fault Code: Electronic card software version failure
An error has occurred in the system due to the Electronic Card electrical voltage.
Download the software again.
88E Fault Code: Communication failure between electronic card and AVS 77 control unit
Reset Combi Max. 5 times
95E Fault Code: AVS 77 control unit clock failure
Reset the boiler Max. 5 times
110E Fault Code: Safety thermostat failure
If the problem persists, press the OK button on the Combi Panel twice.
30 minutes to the combi. wait, reset. If it repeats, please contact us.
119E Fault Code: Hydraulic pressure switch failure
The water pressure of the boiler is insufficient. Our recommended value is between 1.5 and 2.0.
125E Fault Code: No water or air in the system
Press the OK button 2 times on the Combi Panel, the problem is solved.
127E Fault Code: Anti-leyjoner function is on
This Signal is temporary and will automatically disappear when this function ends
130E Fault Code: Chimney NTC sensor overheating
Press the OK button 2 times on the Combi Panel, the problem is solved.
131E Fault Code: Combi boiler power cut after 125E or 130E faults
Press the OK button 2 times on the Combi Panel, the problem is solved.
133E Fault Code: Insufficient gas warning
Make sure that the gas valve next to your boiler is open.
Press the OK button 2 times on the Combi Panel, the problem is solved.
151E Fault Code: Combi control card failure. Check the ignition electrode position
Fault Code 155E: Exceeding the maximum reset attempt (n°5)
Press the “RESET” button on the boiler.
156E Fault Code: Low or high voltage warning
Wait until the energy supply voltage value returns to the normal value.
The reset will be done automatically by the device.
Our recommendation is to install a Regulator on your boiler.
160E Fault Code: Fan failure
Your boiler’s fan motor is faulty
193E Fault Code: System making air. This Signal is temporary and disappears automatically when this function ends.

Baymak Brötje Quasar Faults CODES
Baymak QUASAR 24 Fi
Baymak QUASAR 24 i
30° Degree Light: Gas blockage indicator
40° Degree Light: Overheat Thermostat Circuit Open
50° Degree Light: Fan Failure or Chimney Thermostat Circuit Open
60° Degree Light: Lack of Water or Pump Failure
70° Degree Light: Domestic Water Sensor Failure
80° Degree Light: Heating Circuit Sensor Malfunction
Baykan Combi Fault Codes
E 01 or LED 80°
SYMBOL OCCURING IF NOT FIRED OR BLOCKED
E 02 or LED 60°
CODE THAT THE AIR PRESSURE METER IS BROKEN
E 03 or LED 30°
CODE NOTIFYING THAT THE HEATING THERMOSTAT IS OLD
E 04 or LED 40°
CODE NOTIFYING THAT THE FOUNTAIN THERMOSTAT IS OLD
E 08 or LED 50°
INSUFFICIENT INSTALLATION PRESSURE CODE
E 09 or LED 70°
CODE REGARDING ACTIVATION OF THE SAFETY THERMOSTAT
E 06 or LED 70°
CODE RELATED TO THE TEMPERATURE OF THE SENT WATER EXCEEDING 90°C
E 05 or LED 30° + LED 40°
CODE RELATING TO ABORMALITIES OBSERVED IN THE MODULATOR
E 07 or LED 80° + LED 60°
CODE RELATING TO THE ABNORMALITY IN THE PUMP

ALARKO SERENA FAULT CODES
[E01] No Flame – Make sure that the gas valve and gas gauge on the boiler are open and gas is coming.
[E02] Limit Thermostat Malfunction
[H20] Water Pressure Malfunction
[E05] Heating Sensor Malfunction
[E06] Domestic Water Sensor Failure
[E14] Differential Differential Pressure Switch Malfunction
[E22] Parameter Programming Request
[E35] Flame Detection Malfunction
ARISTON COMBI FAULT CODES
101 Overheating
501 No flame
103 Insufficient circulation
104 Insufficient circulation
105 Insufficient circulation
106 Insufficient circulation
107 Insufficient circulation
111 Insufficient circulation “Press fill key”
601 Exhaust fume evacuation failure
305 P.C.B. failure – Electronic board failure
306 P.C.B. failure – Electronic board failure
307 P.C.B. failure – Electronic board failure
607 Motherboard failure – Air Circulation
677 Motherboard failure – Fan failure

Airfel boiler fault codes
C 20 – Heating flow sensor fault code
The motherboard gives this fault as a result of the failure of the NTC sensor on the heater flow pipe or a short circuit. The reset key may not work in this code.
C 40 – Heater return sensor warning
The motherboard gives this fault as a result of the failure of the NTC sensor on the heater return pipe or a short circuit. The reset key may not work in this code.
C 28 – Flue gas sensor fault code
Error indicating that the flue gas sensor is faulty and cannot read the flue gas temperature. The reset key may not work in this code.
C 78 – Pressure sensor error
It is an error indicating that the pressure sensor is faulty and cannot read the water pressure. The reset key may not work in this code.
C 50 – Domestic water sensor fault code
The motherboard gives this fault when the NTC sensor on the plate heat exchanger fails or a short circuit occurs. The reset key may not work in this code.
C1 05 – Air vent program active
Indicates that the venting program is running. In this code, the key sign appears and returns to normal after a while.
C1 11 – Safety temperature level exceeded
If the value read from the temperature sensors exceeds the limit, this error code is given. Use the reset button and wait for the device to activate.
C1 10 – Limit thermostat activated
In cases where the heating flow water is 93°C or exceeds, the limit thermostat activates for safety and turns off the boiler and gives this fault. Use the reset button and wait for the boiler to activate.
C1 33 – Ignition error
The motherboard gives this error when there is a problem in flame formation or control in the burner. Use the reset button and wait for the device to activate.
C1 17 – High water pressure fault code
Indicates that the water pressure in the heating circuit is high (for 2.5 bar and above). Drain the water of the boiler until the water pressure value is 1.5 on the LCD screen.
C1 18 – Low water pressure
Indicates that the water pressure in the heating circuit is low.
C1 54 – Heating return water temperature higher than heating flow fault code
This error code is temporary. After a while, the boiler continues to operate normally.
C1 29 – Fan failure
If the fan does not start it will give this error.
C1 30 – Flue gas safety temperature exceeded
Indicates that the flue gas temperature is 80-90°C. This error may occur if the chimney is clogged or if there is a blockage in the condensate drain.
C1 56 – Incorrect supply voltage fault code
This error is given when there is a problem with the supply voltage to the board
PROTHERM PANTHER COMBI FAULT CODES
F0- Reduction of water in the heating system
F1- No flame failure
F2- Heating flow sensor malfunction
F3- Device overheating malfunction
F5- Outdoor sensor malfunction

DEMİRDÖKÜM ADEN AND SOLARIS COMBI FAULT CODES
F0- Heating circuit (CH) system at low pressure
F1- Overheat safety thermostat error
F2- Domestic hot water circuit (DHW) temperature sensor error
F3- Heating circuit (CH) temperature sensor error
F4- Flame cap (Ionization) error (requires reset)
F5- Prosestat or chimney sensor error
F6- Outdoor sensor error OC Outdoor sensor connected and OTC ready (not always lit) CC Outdoor sensor canceled signal

ECA Confeo digital and Confeo Premix Boiler Failures
t 6. Fault Code: Flue gas sensor failure (open circuit)
t 6 Fault Code: Flue gas sensor malfunction (short circuit)
t 2 Fault Code: Flue gas over temperature warning
E 4 Fault Code: Differential air pressure switch warning (short circuit)
E 5 Fault Code: Differential air pressure switch warning (open circuit)
E 3 Fault Code: Over-temperature locking (limit thermostat)
t 1 Fault Code: Over temperature warning (electronic limit)
t 3. Fault Code: Central heating temperature sensor failure (open circuit)
t 3 Fault Code: Central heating temperature sensor failure (short circuit)
t 5. Fault Code: Domestic hot water temperature sensor failure (open circuit)
t 5 Fault Code: Domestic hot water temperature sensor malfunction (short circuit)
t 7 Fault Code: Outdoor temperature sensor malfunction (short circuit)
E 1 Fault Code: No flame locking
E 2 Fault Code: Wrong flame signal error
d 1 Fault Code: Flame circuit malfunction
C1 Fault Code: Communication interruption warning with main board
a 1 Fault Code: Low voltage warning on the main board
p 1 Fault Code: Low water pressure warning
y 1 Fault Code: Gas valve circuit malfunction (There are 4 5 reasons for this malfunction, but it is not understood without looking, but it says gas valve or ion problem)

Falke Combi Fault Codes
E01 Gas supply – blocking fault
E02 Safety thermostat sensor
E03 Chimney thermostat sensor / flue pressure sensor malfunction
E05 Heating circuit NTC sensor malfunction
E06 Domestic hot water circuit NTC sensor malfunction
E10 Low water pressure Check whether the water pressure in the system is at the appropriate value.
E25 Maximum temperature warning
E35 Flame formation fault

Bosch Gas, Condensing Combi (Bosch Classic Condense)
A7 Fault Code: Hot water sensor (DHW-NTC) is defective.
Check the DHW temperature sensor and connecting cable.
(Replace the hot water NTC.)
A8 Fault Code: Interruption in BUS communication.
Check the connecting cable and the thermostat.
b1 Fault Code: Code switch is not detected.
Correctly insert the code key, check its number, replace if necessary.
b2 or b3 Fault Code: Internal error.
C6 Fault Code: Fan not working.
Fan Motor Defective Replace.
CC Fault Code: Outdoor sensor not detected.
Connect the outside thermostat and check the cable.
d3 Fault Code: 8 and 9 bridges are missing or external temperature limiter is activated.
The socket is not seated, the bridge is missing, the underfloor heating temperature limiter has been activated.
d5 Fault Code: External (extern) temperature sensor is defective (Balance pan).
Check external temperature sensor and wiring.
E2 Fault Code: Flow water temperature sensor is faulty.
Replace the temperature sensor.
E9 Fault Code: Safety thermostat (STB), waste gas safety sensor or low pressure safety switch in the heat block has been activated.
EA Fault Code: No flame is detected.
Is the gas inlet valve of your boiler open? Check gas inlet pressure, mains connection, ignition electrode and cable, ionization electrode and cable, flue gas pipe and CO2.
F0 Fault Code: Internal error.
F1 Fault Code: Internal error.
F7 Fault Code: Flame continues to be detected even though the device is turned off.
Check the electrodes. Is the flue gas route open? Check if the motherboard is damp.
FA Fault Codes: Flame continues to be detected even though the gas is cut off.
Check the ionization electrode and gas valve. Clean the condensate siphon.
Fd Fault Codes: The reset button was pressed accidentally or for a long time.
Press the reset button again.

Buderus Heiztecnihnik Fault Codes
1 Fault Code: No Flue Draft
If it is flue, check your chimney, if it is Hermatic, check your Fan Motor or Prosostat part.
2 Fault Code: Overheating
There is air in the boiler system, take the air from the circulation engine.
3 Fault Code: No Flame Occurs
Your boiler is not getting gas. Check the gas valve and make sure that gas comes to your apartment by turning on your stove. If the combi has been turned off for a long time, reset it and repeat it 3 times.
4 Fault Code: Reached the Desired Temperature
Check the valves, if any, under your combi. At least 3 of your radiator taps must be open.
Bleed your honeycombs.
5 Fault Code: Potable Water 85 Degrees
Your three-way valve is leaking water to the faulty heating section.
6 Fault Code: No Flame (Ionization Failure)
Reset 3 times, if the fault still persists, your boiler’s motherboard is faulty.
7 Fault Code: There is a Clogging in the Chimney
If your combi is flue, check your chimney and reset it after waiting 20 minutes. If it is Hermatic, the Prosostat of your boiler is faulty.
8 Fault Code: Fuse Fault
You will see the fuses on the motherboard of the boiler from the defective transparent cover, in which the spare fuses are given by the factory.
Reset your combi by replacing it.
9 Fault Code: Computer Failure
Your motherboard is faulty.
E Fault Code: Voltage Too Low
(-) Fault Code: Heating is on. Everything in your combi is normal.

Buderus Logamax u052-24/28K Fault Codes
CL Fault Code: Domestic hot water temperature sensor is defective (Logamax UOS2-24/28K)
Solution: Check the DHW temperature sensor and connecting cable.
SH Fault Code: Interruption in EMS operation
Solution: Check the connecting cable and the thermostat.
CL Fault Code: The domestic water temperature sensor is not installed correctly (Logamax UOS2-24/28K).
Solution: Check the mounting location, remove the sensor and reassemble with heat transfer paste.
CP Fault Code: Boiler sensor is not detected.
Solution: Check the boiler sensor and connecting cable.
9C Fault Code: Code key is not detected.
Solution: Insert the code key correctly, check the number, measure, replace if necessary.
3A Fault Code: Diff. pressure switch opens during operation (Fan speed cannot be achieved).
Solution: Diff. check the pressure switch, flue gas discharge and fan.
QP Fault Code: Diff. pressure switch does not open in quiescence.
Solution: Diff. check the pressure switch.
3C Fault Code: Diff. pressure switch does not close.
Solution: Diff. Check the pressure switch and the flue gas discharge.
– Fault: The outside thermostat is not detected.
Solution: Check the outdoor thermostat and connecting cable.
2E Fault Code: Heating system water pressure is low.
Solution: Check water pressure, top up if necessary. (We recommend it to be between 1.5 and 2.0.)
8Y Fault Code: 8 – 9 bridge is not detected.
Solution: The socket is not seated, the bridge is missing, the underfloor heating temperature limiter has tripped.
2P Fault Code: Sudden or very rapid temperature rise in the heating circuit.
Solution: Check the pump and by-pass line.
4Y Fault Code: Flow water temperature sensor is faulty.
Solution: Check the temperature sensor and connecting cable.
4C Fault Code: Safety thermostat (STB) has been activated.
Solution: Check the installation pressure, temperature sensor, pump, electronic card fuse and remove the air inside the boiler.
6A Fault Code: No flame is detected.
Solution: Is the gas inlet valve open? Check gas inlet pressure, mains connection, ignition electrode and cable, ionization electrode and cable.
EC Fault Code: Internal error
Solution: Check the electrical socket contacts, the connections of the ignition cables, if the problem persists, replace the electronic board.
EL Fault Code: Reference voltage (internal low voltage) faulty
Solution: Replace the electronic board.
6C Fault Code: Flame continues to be detected even though the device is turned off.
Solution: Electrode may have got water, replace the Electrode with its cable.
6C Fault Code: Flame continues to be detected even though the gas is cut off.
Solution: Check gas valve wiring and gas valve, check electrode set, replace if necessary.
EP Fault Code: The reset button was pressed for a long time by mistake (Pressed More Than 30 Seconds).
Solution: Press the reset button again. If it goes to the same fault again, check the reset button.

ECA Fortius Digital Fortius Plus and CALORA Fault Codes
t 6. Fault Code: Flue gas sensor failure (open circuit)
t 6 Fault Code: Flue gas sensor malfunction (short circuit)
t 2 Fault Code: Flue gas over temperature warning
E 4 Fault Code: Differential air pressure switch warning (short circuit)
E 5 Fault Code: Differential air pressure switch warning (open circuit)
E 3 Fault Code: Over-temperature locking (limit thermostat)
t 1 Fault Code: Over temperature warning (electronic limit)
t 3. Fault Code: Central heating temperature sensor failure (open circuit)
t 3 Fault Code: Central heating temperature sensor failure (short circuit)
t 5. Fault Code: Domestic hot water temperature sensor failure (open circuit)
t 5 Fault Code: Domestic hot water temperature sensor malfunction (short circuit)
t 7 Fault Code: Outdoor temperature sensor malfunction (short circuit)
E 1 Fault Code: No flame locking
E 2 Fault Code: Wrong flame signal error
d 1 Fault Code: Flame circuit malfunction
C1 Fault Code: Communication interruption warning with main board
a 1 Fault Code: Low voltage warning on the main board
p 1 Fault Code: Low water pressure warning
y 1 Fault Code: Gas valve circuit malfunction

Immergas Fault Codes
REMOTE CONTROLLER CODES
E64 Fault Code: Selector button 1 is not in the correct position
C ON Fault Code: Room thermostat/remote control is not connected to the combi
E 65 Fault Code: Selector button 11 is not in the correct position
E 66 Fault Code: The temperature measurement sensor of the room thermostat is defective.
COMBI FAULT CODES
E 01 Fault Code: Combustion failure
E 02 Fault Code: Over-temperature safety thermostat has closed the circuit
E 03 Fault Code: Flue gas thermostat is on
E 05 Fault Code: Heating sensor defective
E 06 Fault Code: Domestic water sensor malfunction
E 07 Fault Code: Flue gas test location failure
Check if your chimney has low traction.
E 10 Fault Code: Insufficient water pressure
E 11 Fault Code: Air processor malfunction
E 14 Fault Code: Flame control electrode failure
E 31 Fault Code: The remote controller cannot adapt.

Protherm Combi Lynx Fault Codes
F1 Fault Code: Overheating Safety Error
F2 Fault Code: Domestic Water Sensor failure
Change the Hot Water NTC of your combi and Reset.
F3 Fault Code: Installation Flow Water NTC Sensor Failure
Change the Heater flow NTC of your combi and Reset.
F4 Fault Code: No Gas or Ionization Error
F5 Fault Code: Air Flow Error
Check the air in the combi boilers, if it has not worked for a long time, the circulation motor of the device may be jammed, loosen it and complete the water pressure and reset it.
F6 Fault Code: System Return Water NTC Sensor Failure
Change the Heater return NTC of your boiler and reset it.
F9 Fault Code: Air Flow Switch Contact Error
This fault code can be seen in southerly & windy weather. Do a reset.
Change the Air Prosostat of your Combi and Reset.
F10 Fault Code: Plumbing Water Pressure Error
Make a Reset by completing the water pressure of your boiler insufficient.
F11 Fault Code: Recirculation Error in Installation
There may be air in the Circulation Motor of your combi. If it is tight, loosen it, if the problem persists, replace it.
F12 Fault Code: Low Voltage Error

Süsler Combi Fault Codes
E0 Fault Code: Temporary Failure, Reset the Device, If the problem persists even though you reset it 3 times, the main board is faulty.
E1 Fault Code: No Water in the Circuit
Check the boiler water pressure
E2 Fault Code: Ignition failure
E3 Error Code: Heating water malfunction.
Change the heater NTC of your boiler.
E4 Error Code: Hot Water Error.
Change the Hot Water NTC of your boiler
E6 Fault Code: Fault in safety module or air system

Vaillant Plus Combi Fault Codes
F 22 : The device water pressure is low or the pump is faulty. check water pressure
F 28 : The gas valves coming to your boiler may be closed, your mains voltage may be lower than 220 Volts or the gas valve inside your device may be faulty.
F 29 : The chimney of your boiler may have come off.

Asroyal Combi fault codes
E1 Fault Code: Limit fault on the heat exchanger
The heater safety limit is faulty, replace it. Reset Device.
E2 Fault Code: Hot water limit fault
Hot water safety limit is defective, replace it. Reset Device.
E3 Error Code: Heating water pressure error
Check the water pressure of your combi boiler is insufficient. (Recommended Bar should be between 1.5 and 2.0).
E4 Fault Code: Air Processor malfunction
Change the air process name of your boiler. Reset Device.
E5 Fault Code: Flame error
E6 Fault Code: Hot Water NTC error
Hot water NTC defective, replace it. Reset Device.
E7 Fault Code: Heating NTC error
Heating NTC Faulty, replace it. Reset Device.
E8 Fault Code: System malfunction
Change the main board of your boiler. Reset Device.
Arçelik DGK Series Fault Codes
E01 Fault codes: Failed ignition / gas supply error:
In case of gas incoming to your combi boiler, the device secures itself and E01 code is read on the screen. Press and hold the “R” key for 2 seconds. If the problem persists after resetting 3 times, get technical information.
E02 Fault codes: Overheating safety thermostat error:
E03 Fault codes: Air pressure switch failure:
E04 Fault codes: Safety error due to loss of flame:
Flame settings of your combi should be checked, if the problem persists, check your electrical voltage.
E05 Fault codes: System water sensor failure:
When there is a problem in the installation water sensor, the E05 code is read on the screen. Change your heater NTC.
E06 Fault codes: Domestic water sensor failure:
When there is a problem with the domestic water sensor, the E06 code is read on the screen. Change your hot water NTC.
E10 Fault codes: Low pressure fault:
Check your system pressure.
E25 or E26 Fault codes: Possible pump blocking fault:
Generally, this fault is seen when your combi boiler is off for a long time.
E35 Fault codes: Flame formation failure:
E96 Fault codes: Low voltage error:

DOLCEVITA HERMETIC BOILER FAULT CODES
E01 Fault Code: Gas supply – blockage failure Check your gas valve, make sure that the gas is coming
E02 Fault Code: Safety thermostat sensor failure
E03 Fault Code: Chimney thermostat sensor / chimney pressure sensor failure
E05 Fault Code: Heating circuit NTC sensor failure
E06 Fault Code: Domestic water circuit NTC sensor failure
E10 Fault Code: Low water pressure
E25 Fault Code: Maximum temperature warning (Pump may be stuck)
E35 Fault Code: Flame formation failure – if the electrical connection of your combi boiler is plugged in, try removing the plug and inserting it backwards.

Beko Combi BK 17 HLCD, BK 20 HLCD, BK 26 HLCD Fault Codes
F1 Fault Code: Overheating Safety Thermostat
F2 Fault Code: Hot water NTC sensor is faulty
F3 Fault Code: Heating NTC sensor is faulty
F4 Fault Code: Lights up in case of gas cut off. Gas failure
F5 Fault Code: Air Flow Switch Safety (Air Pressure Switch)
F6 Fault Code: Outdoor sensor
OC: Indicates that the outdoor sensor is active.
CC: Indicates that the outdoor sensor is not active.
F7 Fault Code: Low water pressure or high water pressure

Vaillant LED Combi Fault Codes
1. LIGHT: If the fuse next to the combi is open and the 0/1 position switch of your combi is in the 1 position, this light should come on continuously. If it is not lit, there is a fault in the electrical input or the electronic card of your boiler.
2. LIGHT: It should come on when you open the hot water tap. If it is not on, your combi boiler does not detect that the hot water tap is opened.
3. LIGHT: It should come on when you turn on the heating setting via the combi. If it does not light, the heater adjustment button is broken or the electronic board has malfunctioned.
4. LIGHT: It indicates that the combi fan is operating normally and does not always light up. It only lights up when there is a flame inside the combi. If this light is flashing, there is a fault with the fan.
5. LIGHT: Indicates that your combi boiler has opened the gas paths and that your device performs the ignition process normally. flashing indicates that the water pressure of your boiler is low or there is a problem with the pump.
6. LIGHT: Indicates that a flame has formed inside your combi. If it gives a flashing signal, there is a malfunction in the heat sensors.
7. LIGHT: This light turns red unlike the others. If it is on, it means that there is no gas in your combi boiler or the electrical voltage is low.
F 22 : When the required system pressure is lowered, the indicator on the screen will start to flash. If the pressure drops further, the device goes into malfunction and “F.22” fault code is displayed on the screen.
F28 F29 : If there is no flame in the burner after three ignition attempts, the device does not start and shows a malfunction.

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