How much does it cost to fix boiler error code Cd?

Typical repair cost for the boiler Cd fault is £0-120 including labour.

Cd Low

Boiler Fault Code Cd

Also written as CD — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Cd appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has lost its connection to the remote control or internet monitoring system, so you may not be able to adjust settings via your app or external thermostat. (As reported on Viessmann Vitodens 200)

Pick your boiler brand for the Cd fix

Viessmann Cd 7 models

Source

Information for the Cd 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