BoilerFaultCodesWarmhaus E13 Fault Code
The Warmhaus E13 fault code means: your boiler has shut down because the internal exhaust gases have reached a dangerously high temperature, triggered by a safety sensor.. It appears on 1 Warmhaus model in our database.
Technical description: Exhaust gas temperature sensor error – excessive temperature alarm.
What causes the Warmhaus E13 fault?
This fault occurs when the gases leaving your boiler's exhaust system become too hot, which can damage internal components. The most common reasons are a significant buildup of debris or limescale inside the heat exchanger or a blockage in the flue pipe that prevents heat from escaping properly. In some cases, the sensor itself may have failed and is sending an incorrect temperature reading to the boiler's computer.
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 E13 fault code
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Source
Warmhaus E13 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