How much does it cost to fix Keston error code E36?

Typical repair cost for the Keston E36 fault is £90-180 including labour.

E36 High

Keston E36 Fault Code

Q: What does the Keston E36 fault code mean?

Your boiler has lost communication with its temperature sensor, which means it cannot safely monitor how hot the water is getting and has shut down as a precaution.

The Keston E36 fault code means: your boiler has lost communication with its temperature sensor, which means it cannot safely monitor how hot the water is getting and has shut down as a precaution.. It appears on 7 Keston models in our database.

Technical description: Flow thermistor open circuit – check/replace connections/thermistor

Typical repair cost £90-180 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Keston models that show the E36 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Keston E36 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