200 mm Emergency

Malvern 200 mm Fault Code

Also written as 200MM — same fault.

The Malvern 200 mm fault code means: 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.. It appears on 1 Malvern model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Below eaves
Typical repair cost £250-600 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Malvern models that show the 200 mm fault code

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

Source

Malvern 200 mm fault code information on this page is sourced and cross-checked against the official Malvern service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026