93 Medium

Keston 93 Fault Code

The Keston 93 fault code means: your boiler is providing hot water for your taps but is failing to heat your radiators.. It appears on 1 Keston model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: NO CH OPERATION BUT DHW WORKS OK
Typical repair cost £120-280 (including labour)

DIY fix possible

Check that your room thermostat or smart hub is turned up and calling for heatEnsure the central heating timer or programmer is set to 'On'Replace batteries in your wireless room thermostat if applicable

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Keston models that show the 93 fault code

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

Source

Keston 93 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 7 July 2026