BoilerFaultCodesKeston E44 Fault Code
The Keston E44 fault code means: your boiler has lost communication with the sensor that monitors water returning from your radiators, often causing the system to stop working as a safety precaution.. It appears on 9 Keston models in our database.
Technical description: Return sensor open circuit – check connections to return sensor are in place
What causes the Keston E44 fault?
This fault occurs when the boiler's main control board can no longer read the temperature of the water coming back from your radiators. The most common reason is that the internal sensor has developed an electrical failure or the connecting wires have become loose or damaged. Because the boiler cannot monitor the water temperature accurately, 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 →Keston models that show the E44 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Keston E44 fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026