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Verified boiler fault-code guides
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Baxi · 600 Combi 2
- Baxi E.01.04E.01.04 indicates flame loss detected five times in 24 hours while the burner was on.
- Baxi A.00.34A.00.34 indicates The expected outdoor temperature sensor is not detected or connected correctly.
- Baxi A.02.18A.02.18 indicates An OBD configuration error is reported.
- Baxi A.02.36A.02.36 indicates A functional device is disconnected.
- Baxi A.02.37A.02.37 indicates A passive functional device is disconnected.
- Baxi A.02.45A.02.45 indicates A connection error is detected.
- Baxi A.02.46A.02.46 indicates A device priority error is detected.
- Baxi A.02.48A.02.48 indicates A unit function configuration error is detected.
- Baxi A.02.49A.02.49 indicates A node failed to initialise.
- Baxi A.02.54A.02.54 indicates The OpenTherm bus power supply has an error.
- Baxi A.02.55A.02.55 indicates The serial number is incorrect or missing.
- Baxi A.02.76A.02.76 indicates The internal memory reserved for settings customisation has reached its limit.
- Baxi H.00.42H.00.42 indicates The pressure sensor is open circuit or faulty.
- Baxi H.01.00H.01.00 indicates Communication between the gas valve and boiler PCB has failed temporarily.
- Baxi H.01.05H.01.05 indicates The maximum temperature difference between flow and return has been reached.
- Baxi H.01.08H.01.08 indicates Flow temperature rises too quickly in heating mode; the boiler stops temporarily for 10 minutes.
- Baxi H.01.14H.01.14 indicates The maximum flow temperature has been reached.
- Baxi H.01.18H.01.18 indicates Water circulation has stopped temporarily.
- Baxi H.01.21H.01.21 indicates Flow temperature rises too quickly in domestic hot water mode; the boiler stops temporarily for 10 minutes.
- Baxi H.02.00H.02.00 indicates A reset is in progress.
- Baxi H.02.02H.02.02 indicates The boiler is waiting for its CN1/CN2 configuration settings.
- Baxi H.02.03H.02.03 indicates The CN1/CN2 configuration settings were not entered correctly.
- Baxi H.02.04H.02.04 indicates The boiler PCB settings cannot be read.
- Baxi H.02.05H.02.05 indicates The setting memory is incompatible with the boiler PCB type.
- Baxi H.02.09H.02.09 indicates A blocking input or frost-protection signal is active, partially stopping the boiler.
- Baxi H.02.10H.02.10 indicates A blocking input signal without frost protection is active, stopping the boiler.
- Baxi H.02.12H.02.12 indicates The external device has opened the control unit input signal contact.
- Baxi H.02.38H.02.38 indicates The water hardness value is unavailable.
- Baxi H.02.70H.02.70 indicates The external unit heat-recovery test failed.
- Baxi H.03.00H.03.00 indicates Identification data for the boiler safety device is missing.
- Baxi H.03.01H.03.01 indicates Communication failed in the comfort circuit due to an internal boiler PCB fault.
- Baxi H.03.02H.03.02 indicates A temporary flame loss occurred.
- Baxi H.03.05H.03.05 indicates The power supply voltage is too low.
- Baxi H.03.17H.03.17 indicates A periodic safety check is in progress.
- Baxi H.03.54H.03.54 indicates The boiler stopped because the power supply voltage was too low.
- Baxi E.00.04E.00.04 indicates The return temperature sensor is disconnected.
- Baxi E.00.05E.00.05 indicates The return temperature sensor is short-circuited.
- Baxi E.00.06E.00.06 indicates The return sensor is expected but not detected.
- Baxi E.00.07E.00.07 indicates The difference in return temperature is too great.
- Baxi E.00.16E.00.16 indicates The domestic hot water tank temperature sensor is not connected.
- Baxi E.00.17E.00.17 indicates The domestic hot water tank temperature sensor is short-circuited.
- Baxi E.00.20E.00.20 indicates The flue gas temperature sensor is short-circuited or measures below its range.
- Baxi E.00.21E.00.21 indicates The flue gas temperature sensor is short-circuited or measures above its range.
- Baxi E.01.12E.01.12 indicates The return sensor measures a higher temperature than the flow sensor.
- Baxi E.01.17E.01.17 indicates Water circulation has stopped permanently.
- Baxi E.01.20E.01.20 indicates The maximum flue gas temperature has been reached.
- Baxi E.02.13E.02.13 indicates The external environment-control device has activated its stoppage input.
- Baxi E.02.15E.02.15 indicates Communication with an external PCB timed out.
- Baxi E.02.17E.02.17 indicates Communication between the gas valve and boiler PCB has failed permanently.
- Baxi E.02.35E.02.35 indicates A critical safety device is disconnected.
- Baxi E.02.47E.02.47 indicates The connection to an external device was unsuccessful.
- Baxi E.04.00E.04.00 indicates The level 5 safety settings are incorrect.
- Baxi E.04.01E.04.01 indicates The flow temperature sensor is short-circuited.
- Baxi E.04.02E.04.02 indicates The flow temperature sensor is disconnected.
- Baxi E.04.03E.04.03 indicates The maximum flow temperature has been exceeded.
- Baxi E.04.07E.04.07 indicates The temperature readings from flow sensors 1 and 2 differ.
- Baxi E.04.08E.04.08 indicates The maximum safe temperature has been reached.
- Baxi E.04.09E.04.09 indicates The temperature readings from flue gas sensors 1 and 2 differ.
- Baxi E.04.11E.04.11 indicates The VPS gas valve test failed.
- Baxi E.04.12E.04.12 indicates Ignition failed during monitoring for a parasitic flame.
- Baxi E.04.13E.04.13 indicates The fan blade is blocked.
- Baxi E.04.14E.04.14 indicates The temperature difference between the set point and burner differs from the GVC configuration for more than 60 seconds.
- Baxi E.04.15E.04.15 indicates The flue gas exhaust pipe is blocked.
- Baxi E.04.17E.04.17 indicates The gas valve control circuit has a fault.
- Baxi E.04.18E.04.18 indicates The measured flow temperature is below the minimum set by the GVC setting.
- Baxi E.04.19E.04.19 indicates The mass flow-rate sensor has a communication error.
- Baxi E.04.20E.04.20 indicates The mass flow-rate sensor has exceeded its maximum deviation.
- Baxi E.04.21E.04.21 indicates A difference was detected between the temperature sensors for burners 1 and 2.
- Baxi E.04.23E.04.23 indicates The gas valve check valve has stopped internally.
- Baxi E.04.24E.04.24 indicates The gas family was not detected during automatic detection.
- Baxi E.04.54E.04.54 indicates The gas valve control circuit has a fault.
- Baxi A.02.06A.02.06 indicates low system water pressure.
- Baxi H.02.07H.02.07 indicates that pressure in the heating circuit is permanently low.
- Baxi E.04.10E.04.10 indicates that the burner failed to ignite after four attempts.
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