BoilerFaultCodesWarmhaus E89 Fault Code
The Warmhaus E89 fault code means: your boiler has stopped working because it cannot detect a stable flame, often due to a problem with the gas supply or a faulty internal sensor.. It appears on 1 Warmhaus model in our database.
Technical description: Problem on combustion feedback signal – gas pressure needs checking.
What causes the Warmhaus E89 fault?
This fault occurs when the boiler's internal computer tries to light a flame but cannot detect a stable fire through its sensors. The most common reasons are a disruption in the gas supply to the house, a buildup of carbon on the sensing probe, or a mechanical failure of the gas valve that prevents the fuel from flowing correctly.
This issue is more frequent during very cold spells when external gas regulators can freeze or high demand on the local network causes a drop in gas pressure.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Warmhaus models that show the E89 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmhaus E89 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