Baxi Baxi 600/800/Assure System 2 and 600 Combi 2 platform fault H.01.08
Flow temperature increase in heating mode too quick
Gas boilerWhat it means
Temporary stoppage of 10 minutes due to flow temperature increasing too quickly in heating mode, caused by insufficient circulation or other causes
Likely causes
- Insufficient boiler/installation circulation
- Air in system
- Low installation pressure
- Dirty exchanger
- Faulty temperature sensors
- Poor sensor connection
Where to start
- Check the boiler/installation circulation
- Check the installation pressure
- Check the cleanliness of the exchanger
The full answer, free
- 2 more checks in order
- How to put it right, step by step
- The manual page for this fault (page 74), right under the answer
Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.
From the Baxi manual for the Baxi 600/800/Assure System 2 and 600 Combi 2 platform. Check the model on the data plate before you order parts.
Other Baxi Baxi 600/800/Assure System 2 and 600 Combi 2 platform fault codes
- 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
- E.01.12Return sensor temperature 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.04.09Difference between flue gas sensors 1 and 2 temperature values
- 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 exceeds 60s vs GVC configuration
- E.04.15Flue gas exhaust pipe blocked
- E.04.23Gas valve check valve internal stoppage
- E.04.24Gas family not detected during automatic detection function
- E.04.54Fault in gas valve control circuit
- GC007Failed start-up attempts
- GM044-10Heating flow temperature above the shutdown value
- GM044-12Shutdown caused by flame value being too low
- GM044-3Awaiting burner ignition
- GM044-4Heating flow temperature above maximum value
- GM044-5Heating flow temperature above the starting value