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Verified boiler fault-code guides
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Baxi · 400 Combi 2.1
- Baxi H.02.70External unit heat recovery test failed.
- Baxi E.01.12Temperature measured by return sensor greater than flow temperature.
- Baxi E.02.39Minimum pressure not reached after 6 minutes of automatic filling.
- Baxi A.00.28Solar temperature sensor is either removed or measures a temperature below range.
- Baxi A.00.29Solar temperature sensor is either shorted or measures a temperature above range.
- Baxi A.02.18OBD error.
- Baxi A.02.36Functional device disconnected.
- Baxi A.02.37Passive functional device disconnected.
- Baxi A.02.49Failed node initialisation.
- Baxi A.02.54OpenTherm bus power supply error.
- Baxi A.02.55Incorrect or missing serial number.
- Baxi A.02.76Internal memory reserved for full customisation of settings. No further changes can be made.
- Baxi H.02.02Waiting for configuration settings to be entered (CN1,CN2).
- Baxi H.02.03Configuration settings (CN1,CN2) not entered correctly.
- Baxi H.02.05Setting memory not compatible with the boiler PCB type.
- Baxi E.00.16DHW tank temperature sensor not connected.
- Baxi E.00.17DHW tank temperature sensor short-circuited.
- Baxi A.02.06A.02.06 indicates low system pressure in the heating circuit.
- 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; the Quick Start guide notes that a frozen condensate pipe is often the cause.
- Baxi H.01.05Maximum temperature difference value between flow and return reached
- Baxi H.00.42Pressure sensor open/faulty
- Baxi E.04.08Maximum safe temperature value reached
- Baxi E.04.13Fan impeller blocked or maximum rpm exceeded
- Baxi E.00.20The flue gas temperature sensor is not connected or measured a temperature below the range
- Baxi E.00.21The flue gas temperature sensor has short-circuited or measured a temperature above the range
- Baxi A.00.34Outdoor temperature sensor expected but not detected.
- Baxi H.00.81Room unit disconnected.
- Baxi H.01.08Flow temperature increase in heating mode too quick; temporary stoppage of 10 minutes.
- Baxi H.01.18No water circulation (temporary).
- Baxi H.01.21Flow temperature increase during hot water operation too fast.
- Baxi H.03.05Power supply voltage too low.
- Baxi E.00.04Return temperature sensor disconnected.
- Baxi E.00.05Return temperature sensor short circuited.
- Baxi E.01.17No water circulation (permanent).
- Baxi E.04.01Flow temperature sensor short circuited.
- Baxi E.04.02Flow temperature sensor disconnected.
- Baxi H.02.04PCB settings cannot be read.
- Baxi H.03.00No identification data for boiler safety device.
- Baxi E.04.18The flow temperature is below the minimum temperature or the flow temperature sensor is not connected.
- Baxi E.04.23Communication internal stoppage.
- Baxi E.04.29Communication internal stoppage.
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