BoilerFaultCodesWarmhaus E16 Fault Code
The Warmhaus E16 fault code means: your boiler has detected a fault with a secondary temperature sensor that monitors water returning to the unit, causing it to stop operating for safety.. It appears on 1 Warmhaus model in our database.
Technical description: AUX return sensor failure
What causes the Warmhaus E16 fault?
This fault occurs when the boiler's internal computer receives an incorrect or missing signal from the sensor that monitors water coming back from your radiators. This is usually caused by the sensor itself burning out or developing a physical defect, but it can also happen if the internal wiring has become loose or damaged. Because the boiler cannot accurately track the water temperature, it shuts down to prevent the system from overheating.
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 E16 fault code
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Source
Warmhaus E16 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