How much does it cost to fix Keston error code E 36?

Typical repair cost for the Keston E 36 fault is £120-200 including labour.

E 36 High

Keston E 36 Fault Code

Q: What does the Keston E 36 fault code mean?

Your boiler has lost the ability to measure the temperature of the water flowing through it because a sensor connection has failed or disconnected.

Also written as E36 — same fault.

The Keston E 36 fault code means: your boiler has lost the ability to measure the temperature of the water flowing through it because a sensor connection has failed or disconnected.. It appears on 3 Keston models in our database.

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

Typical repair cost £120-200 (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 E 36 fault code

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

Source

Keston E 36 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