How much does it cost to fix boiler error code 65:3?

Typical repair cost for the boiler 65:3 fault is £220-380 including labour.

65:3 High

Boiler Fault Code 65:3

Also written as 653 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 65:3 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to switch the flow of heated water between your radiators and your hot water taps because of an internal valve malfunction. (As reported on Viessmann Vitodens 200)

Pick your boiler brand for the 65:3 fix

Viessmann 65:3 5 models

Source

Information for the 65:3 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026