BoilerFaultCodes
Malvern Boiler Fault Codes
36 fault codes across 3 Malvern boiler models — explained in plain English.
Malvern condensing boilers.
Malvern fault codes on this site
We document 36 fault codes across 3 Malvern models, covering 32 distinct codes. Malvern boilers use a mix of numbered codes and light or status indications. Codes for 3 of these models are taken directly from the manufacturer's own service or installation manual. Malvern is a smaller name in the UK market, and if you own one this is likely one of the few places its fault codes are collected in one place.
Models covered: Combi, TenTwenty, 20/26.
Codes that appear on the most Malvern models:
Just want the most common Malvern problems?
The top 8 faults across the whole Malvern range — causes, DIY checks, repair costs.
High-severity Malvern fault codes
10 20 30 40 50
Your boiler is struggling to accurately read its own operating temperature due to a sensor measurement error.
Combi
Your boiler is struggling to accurately read its own internal water temperature because the sensor responsible for this measurement is sending an incorrect or impossible signal.
Combi
Your boiler is struggling to accurately measure the temperature of the water, which is causing it to shut down for safety reasons.
Combi
Your boiler is struggling to accurately measure its own temperature, causing it to shut down for safety reasons to prevent overheating.
Combi
Your boiler's temperature sensor is providing an incorrect reading, which is causing the system to shut down to prevent overheating.
Combi
All models
3 Malvern boiler models
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