F0 – F71 Error Code: Indicates a fault in the sensor that
measures the temperature of the water sent to the radiators by the boiler.
There may be an issue with the sensor, its connections, or a broken cable.
Contact service for a solution.
F1 Error Code: Indicates a fault in the sensor measuring
the temperature of the water returning from the radiators. The sensor
connections or cables may be faulty. Contact service for a solution.
F5 Error Code: In chimney boilers, it indicates an issue
with the sensor managing the proper expulsion of gases from the waste gas
system or a connection fault. Call the service.
F6 Error Code: Indicates a disconnection, a fault in the
waste gas chimney sensor, or improper electrical connections. Contact
service for assistance.
F10 Error Code: Indicates a fault in the sensor measuring
the water temperature sent to the radiator system or short-circuited cables.
Contact service for a solution.
F11 Error Code: Indicates a fault in the sensor measuring
the return water temperature from radiators or short-circuited cables. Call
the service.
F13 Error Code: Indicates a fault in the NTC sensor,
cable disconnections, or issues in electronic connections. Service
intervention is required.
F15 Error Code: In chimney boilers, indicates a fault or
short-circuit in the sensor managing the expulsion of waste gases and
notifying the main board. Contact service for assistance.
F16 Error Code: In both atmoTEC and turboTEC models,
indicates a fault or short-circuit in the sensor managing the intake of
clean air into the boiler. Service intervention is required.
F20 Error Code: Indicates a fault or problem with the
thermal connections of the boiler's flow sensor. Contact service for a
solution.
F22/F23/F24 Error Codes: These codes indicate that there
is no water in the system and the pressure has dropped to zero. Open the
filling tap under the boiler and increase the pressure to 1.5 bar.
F25 Error Code: Indicates a problem with the limit
thermostat. Wait for the boiler to cool down. If the problem persists,
contact the service.
F26 Error Code: Indicates an issue with the electrical
flow to the boiler. There may be a problem with the control board or the
gas valve. Contact service for assistance.
F27 Error Code: Indicates that the gas valve is closed,
but the ionization flame detection signal is being sent. The gas valve may
be leaking, or there may be a problem with the ionization electrode. Contact
service for a solution.
F28 Error Code: Indicates a failure to ignite. Reset the
device. If the problem persists, contact service.
F29 Error Code: Indicates that the flame extinguished
during operation, and the boiler has entered a fault state. There may be
an issue with the gas supply. Contact service for assistance.
F33 Error Code: Indicates that the air pressure switch
contacts are not closed and remain open. This may be due to a malfunction
in the air pressure switch or incorrect installation of the chimney parts.
F36 Error Code: Indicates that the process of expelling
waste gases after combustion is not being managed correctly. This may be
due to insufficient combustion air or a blocked chimney. Contact service
for assistance.
F49 Error Code: Indicates a problem caused by low voltage.
Initially, seek help from an electrician to check the voltage. Contact
service for assistance.
F61 Error Code: Known as a gas valve fault. Contact
service for assistance.
Vaillant EcoFIT Start Boiler Error Codes
Error Code F01: Overheating. The limit thermostat or overheating thermostat stops circulation.
(RESET) The flue gas temperature sensor in the heat exchanger is faulty.
Error Code F02: NTC fault (hot water). Hot water temperature is out of the permissible range.
Error Code F07: Faulty gas valve. Control fault. (RESET)
Error Code F08: NTC sensor (return circuit) overheating.
Return circuit temperature is too high.
Error Code F09: Air pressure switch fault. If the pressure switch stays closed for 15 seconds (when not operational), the fan stops (error message is created). When the pressure switch reopens (when operational), normal operation automatically starts.
Error Code F10: System pressure is incorrect. The heating circuit pump is blocked, the pump power is low, air is present in the system, or the supply and return NTCs are mixed up.
Error Code F11: Overheating. The hot water temperature gradient is too high (heating mode). The heating circuit pump is blocked, pump power is low, air is present in the system, system pressure is too low, or the check valve is blocked/incorrectly installed.
Error Code F12: Low voltage.
Error Code F13: NTC sensors are not properly connected or not connected at all. The gas valve stepper motor is not connected, the multi-socket on the control board is improperly connected, a cable harness fault exists, or the gas valve stepper motor or electronic control system is faulty.
Error Code F14: Incorrect flame. Ignition is blocked. The ignition signal is outside the predefined time interval by 5 seconds. (RESET)
Error Code F15: No flame. The flame is inactive, and ignition is blocked.
Vaillant EcoTEC Boiler Error Codes
Error Code F00: Radiator NTC fault. Indicates a fault in the sensor used to measure the temperature of the water sent to the system. Replacement may be necessary. Contact a service technician for assistance.
Error Code F01: Radiator NTC fault. Indicates a problem in the return water temperature sensor. Cable issues may also occur alongside sensor faults. Contact a service technician for assistance.
Error Code F10: Indicates a short circuit in the NTC sensor measuring water temperature sent to the radiators. Contact a service technician for assistance.
Error Code F13: Indicates that the boiler sensor cable connections are broken, there is a short circuit, or the sensor is faulty. Contact a service technician for assistance.
Error Code F20: Indicates that the flue gas temperature is above the allowable level. Contact a service technician for assistance.
Error Code F27: Gas valve is closed, but ions detect a flame. The ionization electrode or gas valves may be faulty. Contact a service technician for assistance.
Error Code F28: Ignition fault. The boiler attempts to ignite but fails to produce a flame. Contact a service technician for assistance.
Error Code F29: The flame goes out after the boiler starts, causing it to shut down. Contact a service technician for assistance.
Error Code F32: Indicates issues with the fan motor being stuck, faulty cable harness, or sensor issues. Contact a service technician for assistance.
Error Code F37: Indicates a fault in the fan motor speed. Check and adjust the water level to 1.5 bar. If the level is normal, contact a service technician for assistance.
Error Code F42-F43: Indicates a break or short circuit in the cable harness. Contact a service technician for assistance.
Error Code F49: Voltage issue. The boiler automatically resets itself. If the problem persists, contact a service technician for assistance.
Error Code F61: Gas valve fault. Issues may lie with the cable harness or the gas assembly. Contact a service technician for assistance.
Error Code F62: The gas valve does not close or is delayed. Contact a service technician for assistance.
Error Code F60-F63-F64-F65-F67: Any of these codes indicate damage to the control board. If repair is possible, have it repaired; otherwise, replace the board.
Error Code F71: Return water temperature NTC reports a constant value. Contact a service technician for assistance.
Error Code F73: Low signal from the water pressure NTC. Indicates a fault in the water pressure sensor. Contact a service technician for assistance.
Error Code F74: High signal from the water pressure NTC. Cable connection or internal sensor fault may be present.
Error Code F75: Pump fails to detect pressure difference while operating. Check water levels; if normal, there may be an issue with the sensor or pump. Contact a service technician for assistance.
Error Code F77: Condensate pump fault. Contact a service technician for assistance.
Error Code F78: Hot water outlet NTC interruption from external regulator. Contact a service technician for assistance.
Error Code F83: No temperature change detected in the supply or return water NTC. Contact a service technician for assistance.
Error Code F84: Supply and return water NTCs are reporting inconsistent values. Contact a service technician for assistance.
Error Code F85: Supply or return water NTC incorrectly installed. Contact a service technician for assistance.
Vaillant TurboTEC Boiler Error Codes
TurboTEC F0–F71 Error Code: Indicates a fault in the sensor measuring the temperature of the water sent to the radiators. The sensor, connections, or cables may be faulty. It is recommended to call a technician for precise diagnosis and resolution.
TurboTEC F1 Error Code: Indicates a fault in the sensor measuring the temperature of the return water from the radiators. Call a technician for precise diagnosis and resolution.
TurboTEC F5 Error Code: In flue-type boilers, indicates a fault in the sensor responsible for ensuring proper exhaust of the flue gases. Call a technician for resolution.
TurboTEC F6 Error Code: Indicates a fault in the PTC sensor or connections within the flue system of flue-type boilers. Call a technician for resolution.
TurboTEC F10 Error Code: Indicates a fault or short circuit in the sensor measuring the temperature of the water sent to the heating system. Call a technician for resolution.
TurboTEC F11 Error Code: Indicates a fault or short circuit in the sensor or cables on the return line of the heating system. Call a technician for resolution.
TurboTEC F13 Error Code: Indicates a problem in the NTC sensor, cable disconnection, or electronic card connections. Call a technician for resolution.
TurboTEC F15 Error Code: In flue-type boilers, indicates a fault or short circuit in the PTC sensor responsible for ensuring proper exhaust of the flue gases and reporting to the control board. Call a technician for resolution.
TurboTEC F16 Error Code: Indicates a fault or short circuit in the PTC sensor within the flue system. Call a technician for resolution.
TurboTEC F20 Error Code: Indicates a connection problem or fault in the heating sensor. In such cases, the device may continue operating without stopping. Call a technician for resolution.
TurboTEC F22/F23/F24 Error Code: Indicates that the boiler has no water and the pressure has dropped to zero. Open the filling loop below the boiler and increase the pressure to 1.5 bar.
TurboTEC F25 Error Code: Indicates a problem with the limit thermostat. Ensure the radiator valves and boiler valves are open, and check the pressure, increasing it if necessary.
TurboTEC F26 Error Code: Indicates improper electrical flow to the boiler. The problem may lie in the electronic board or gas valve. Call a technician for resolution.
TurboTEC F27 Error Code: Indicates that the gas valve is closed, but the ionization flame signal is being sent. There may be a leak in the gas valves or a problem with the ionization electrode.
TurboTEC F28 Error Code: Displays when the boiler fails to ignite. Press the reset button and call a technician if the issue persists.
TurboTEC F29 Error Code: Indicates that the flame extinguishes while the boiler is operating, causing the device to stop. There may be an issue with the gas supply or circulation.
TurboTEC F33 Error Code: Indicates an issue with the air pressure switch or improper installation of the flue. Call a technician for resolution.
TurboTEC F36 Error Code: Indicates that the flue gases are not being expelled after combustion. The flue may be blocked.
TurboTEC F49 Error Code: Indicates a voltage drop issue. Check the voltage and use a regulator if it is low.
TurboTEC F61 Error Code: Indicates a fault in the gas valve. The issue may lie in the gas valve or electronic board.
TurboTEC F62 Error Code: Indicates that the gas valve does not close or closes with a delay. Call a technician for resolution.
TurboTEC F63 Error Code: Indicates a fault in the electronic board. Call a technician for resolution.
TurboTEC F64 Error Code: Indicates a short circuit in the boiler’s water cycle or a fault in the electronic board.
TurboTEC F65 Error Code: Indicates overheating of the electronic board. Call a technician for resolution.
TurboTEC F67 Error Code: Indicates ionization voltage causing a fault in the electronic board, rendering the device inoperable.
TurboTEC F70 Error Code: Displays when the electronic board and display board are incompatible.
TurboTEC F72 Error Code: Indicates a fault in the sensor measuring the water cycle of the boiler.
TurboTEC F73 Error Code: Indicates a fault or short circuit in the pressure sensor.
TurboTEC F75 Error Code: The pump fails to detect a pressure difference while operating.
TurboTEC F77 Error Code: Condensate pump fault.
Vaillant TurboTEC Plus Boiler Error Codes
TurboTEC Plus Error Code: Water temperature fluctuates between hot and cold. Check the boiler display. If a snail-like symbol appears and disappears, there may be an issue with the flue system. Check if the flue is detached. Call a technician for resolution.
TurboTEC Plus F0–F71 Error Code: Indicates a fault in the sensor measuring the water temperature sent to the radiators. Call a technician for resolution.
TurboTEC Plus F1 Error Code: Indicates a fault in the return water temperature sensor. Call a technician for resolution.
TurboTEC Plus F5 Error Code: Indicates a fault in the sensor ensuring proper flue gas exhaust in flue-type boilers. Call a technician for resolution.
TurboTEC Plus F6 Error Code: Indicates a fault in the PTC sensor or connections in the flue system of flue-type boilers. Call a technician for resolution.
TurboTEC Plus F10 Error Code: Indicates a fault or short circuit in the sensor measuring the water temperature sent to the heating system. Call a technician for resolution.
TurboTEC Plus F11 Error Code: Indicates a fault in the return line sensor or short circuit in the cables of the heating system. Call a technician for resolution.
TurboTEC Plus F13 Error Code: Indicates a fault in the NTC sensor, cable disconnection, or electronic board connections. Call a technician for resolution.
TurboTEC Plus F15 Error Code: Indicates a fault or short circuit in the PTC sensor ensuring proper flue gas exhaust in flue-type boilers. Call a technician for resolution.
TurboTEC Plus F16 Error Code: Indicates a fault or short circuit in the PTC sensor within the flue system. Call a technician for resolution.
TurboTEC Plus F20 Error Code: Indicates a connection problem or fault in the heating sensor. Call a technician for resolution.
TurboTEC Plus F22/F23/F24 Error Code: Indicates that the boiler has no water and the pressure has dropped to zero. Open the filling loop below the boiler and increase the pressure to 1.5 bar.
TurboTEC Plus F25 Error Code: Indicates a fault in the limit thermostat. Allow the boiler to cool. Call a technician for resolution.
TurboTEC Plus F26 Error Code: Indicates improper electrical flow to the boiler. Call a technician for resolution.
TurboTEC Plus F27 Error Code: Indicates the gas valve is closed, but the ionization flame signal is being sent. There may be a leak in the gas valves or an issue with the ionization electrode.
TurboTEC Plus F28 Error Code: Displays when the boiler fails to ignite. Press the reset button and call a technician if the issue persists.
TurboTEC Plus F29 Error Code: Indicates that the flame extinguishes while the boiler is operating. There may be an issue with the gas supply or circulation.
TurboTEC Plus F33 Error Code: Indicates an issue with the air pressure switch or improper installation of the flue. Call a technician for resolution.
TurboTEC Plus F36 Error Code: Indicates that the flue gases are not being expelled after combustion. The flue may be blocked.
TurboTEC Plus F49 Error Code: Indicates a voltage drop issue. Check the voltage and use a regulator if it is low.
TurboTEC Plus F61 Error Code: Indicates a fault in the gas valve. The issue may lie in the gas valve or electronic board.
TurboTEC Plus F62 Error Code: Indicates that the gas valve does not close or closes with a delay. Call a technician for resolution.
TurboTEC Plus F63 Error Code: Indicates a fault in the electronic board. Call a technician for resolution.
TurboTEC Plus F64 Error Code: Indicates a short circuit in the boiler’s water cycle or a fault in the electronic board.
TurboTEC Plus F65 Error Code: Indicates overheating of the electronic board. Call a technician for resolution.
TurboTEC Plus F67 Error Code: Indicates ionization voltage causing a fault in the electronic board.
TurboTEC Plus F70 Error Code: Displays when the electronic board and display board are incompatible.
TurboTEC Plus F72 Error Code: Indicates a fault in the sensor measuring the water cycle of the boiler.
TurboTEC Plus F73 Error Code: Indicates a fault or short circuit in the pressure sensor.
TurboTEC Plus F75 Error Code: The pump fails to detect a pressure difference while operating.
TurboTEC Plus F77 Error Code: Condensate pump fault.
Vaillant Vuw Pro Boiler Error Codes
1st LED Blinking: The boiler has shut down to prevent overheating. Check the radiator valves; if closed, open them. If the fault persists, perform three resets. If the issue remains unresolved, contact a technician.
1st LED Off: Check the switches. The main switch and the switch next to the boiler must be on. If they are on but the light is still off, there may be an issue with the cable connections, main board, or transformer. Call for service.
2nd LED On: The boiler is operating in hot water demand mode. There is no issue with the boiler. However, if hot water is not being supplied, there might be a problem with the three-way valve system. Call for service.
2nd LED Off: If the 2nd LED does not light up when you open the hot water tap and no hot water is provided, there might be an issue with the water flow turbine. Contact a technician.
3rd LED On: The boiler is operating in winter mode. If the radiators are not heating, there might be an issue with the three-way valve or the system could be clogged. Call for service.
3rd LED Off: Check if the boiler is in winter mode. If there is a room thermostat, ensure it is sending a heating request to the boiler. If the problem persists, there might be an issue with the main board. Call for service.
4th LED Blinking: The boiler is in flue gas testing mode. In flue-type boilers, the flue might be blocked. In hermetic boilers, the pressure switch might not be functioning. Contact a technician.
4th LED Off: In flue-type boilers, the flue may be blocked or not drawing properly, or the flue sensor may be faulty. In hermetic boilers, the fan, main board, or pressure switch may be malfunctioning, or the air intake pipe may have become detached. Call for service.
5th LED Blinking: There may be air in the primary heat exchanger, low gas pressure, or low water pressure in the boiler. Increase the pressure to 1.5 bar. If the issue persists, contact a technician.
5th LED Off: If the gas valve cannot be operated or the main board is faulty, this issue occurs. Call for service to diagnose and resolve the problem.
6th LED Blinking: There may be a short circuit or disconnection in the flow and return sensors of the system. Contact a technician.
6th LED Off: The boiler may not ignite. Ensure gas is reaching the boiler. If the gas is flowing and the issue persists, call for service.
7th LED Blinking: Indicates a problem with the microprocessor in the boiler. There may be a fault in the electronic board. Contact a technician.
7th LED On: If the boiler has made three ignition attempts but fails to ignite, there may be an issue with the gas valve or main board. Call for service.
7th LED Off: Ignition failure. Contact a technician for diagnosis and resolution.
If you are unable to resolve the issue using the error codes, please contact us!
