How much does it cost to fix boiler error code 200 mm?

Typical repair cost for the boiler 200 mm fault is £250-600 including labour.

200 mm Emergency

Boiler Fault Code 200 mm

Also written as 200MM — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 200 mm appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's flue terminal is positioned too close to the roof overhang, which is preventing exhaust gases from safely dispersing and potentially causing them to be pulled back into the property. (As reported on Malvern TenTwenty)

Pick your boiler brand for the 200 mm fix

Malvern 200 mm 1 model

Source

Information for the 200 mm 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 7 July 2026