Vaillant

F.20 Vaillant Boiler Vaillant F.20 means the boiler shut down because the flow temperature climbed … F.27 Vaillant Boiler Vaillant F.27 is 'sham flame' — the flame sensor signals it sees a flame when … F.32 Vaillant Boiler Vaillant F.32 means the fan speed reported back to the PCB does not match the … F.42 Vaillant Boiler Vaillant F.42 means the coding resistor circuit is faulty.<br>The coding … F.62 Vaillant Boiler Vaillant F.62 means the gas valve did not close within the expected time after … F.65 Vaillant Boiler Vaillant F.65 means the PCB itself measured temperature above its safe operating … F23 Vaillant Water Heater F23 is the low-pressure code on Vaillant boilers — system pressure has dropped … F24 Vaillant Water Heater F24 means the boiler has detected poor water circulation through the heat … F61 Vaillant Water Heater F61 is a gas valve fault on Vaillant boilers — the control board can't drive the … F.22 Vaillant Boiler F.22 means the system water pressure has fallen below 0.5 bar.<br>Re-pressurise … F.28 Vaillant Boiler F.28 means the boiler attempted ignition but failed during startup.<br>The most … F.29 Vaillant Boiler F.29 means the burner lit but the flame was lost during operation.<br>Common … F.75 Vaillant Boiler F.75 means low system pressure or water flow detected by the pump and pressure …