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Baxi Baxi 200/400/600/800 Combi 2 & System 2 Baxi 600/800/Assure System 2 and 600 Combi 2 platform fault codes

32 codes from the Baxi manual for the Baxi 200/400/600/800 Combi 2 & System 2 Baxi 600/800/Assure System 2 and 600 Combi 2 platform gas boiler. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
A.00.34Outdoor temperature sensor expected but not detected
A.02.06Low water pressure
AC004Failed start-up attempts after last maintenance
DC004Number of burner start-ups for DHW mode
DC005Number of burner start-up hours for DHW mode
E.01.04Flame loss detected five times in 24 hours (with burner on)
E.01.12Temperature measured by return sensor greater than flow temperature
E.01.17No water circulation (permanent)
E.01.20Maximum flue gas temperature reached
E.04.08Maximum safe temperature value reached
E.04.10Burner failed to ignite after 4 attempts
E.04.11VPS gas valve test failed
E.04.12Ignition failure for monitoring parasitic flame
E.04.14Temperature difference between set point and burner varies more than 60s compared to...
E.04.15Flue gas exhaust pipe blocked
E.04.17Fault in gas valve control circuit
E.04.23Gas valve check valve internal stoppage
E.04.24Gas family not detected during the automatic detection function
E.04.54Fault in gas valve control circuit
GC007Failed start-up attempts
H.01.05Maximum temperature difference value between flow and return reached
H.01.08Flow temperature increase in heating mode too quick (10 minute stoppage)
H.01.18No water circulation (temporary)
H.01.21Flow temperature increase in domestic water mode too quick (10 minute stoppage)
H.02.09Partial stoppage of the boiler, signal indicating blocking input active or frost...
H.02.10Complete stoppage of the boiler, blocking input signal (without frost protection)
H.03.02Temporary flame loss
H.03.54Temporary flame loss / shutdown due to low power supply voltage
PC002Number of burner start-ups for heating and DHW mode
PC003Number of burner start-up hours for heating and DHW mode
PC004Burner flame leaks
STATUS9Temporary fault