BoilerFaultCodesWarmhaus E78 Fault Code
The Warmhaus E78 fault code means: your boiler has reached its safety limit for monitoring the gas flame and cannot adjust itself correctly to heat your home.. It appears on 1 Warmhaus model in our database.
Technical description: Regulation current value has been reached. Try resetting the boiler, check the gas pressure and check the combustion values and CO2 calibration – if this doesn’t work the board or valve needs replacing.
What causes the Warmhaus E78 fault?
This fault occurs when the boiler's control system can no longer accurately monitor or adjust the flame to ensure safe burning. It usually means the electronic signals between the gas valve and the main control board have drifted outside of safe limits, often due to a failing component or poor gas flow. As a result, the boiler shuts down because it cannot guarantee the fuel is burning efficiently or safely.
DIY fix possible
Press and hold the reset button for 3 secondsEnsure your gas meter has credit (if applicable)Check that other gas appliances in your home are working correctly
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Warmhaus models that show the E78 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmhaus E78 fault code information on this page is sourced and cross-checked against the official Warmhaus service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026