BoilerFaultCodes
Malvern Boiler Fault Codes
26 fault codes across 3 Malvern boiler models — explained in plain English.
Malvern condensing boilers.
Malvern fault codes on this site
We document 26 fault codes across 3 Malvern models, covering 23 distinct codes. Malvern boilers use light sequences and status descriptions rather than numbered codes. 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
Phase reversed neon (behind the knob) lighting Lockout lamp illuminating (Overheat Thermostat) 300 300 mm 75 mm
Your boiler has detected that the incoming electrical wires are connected the wrong way around, preventing it from safely starting the main burner.
TenTwenty
Your boiler has switched itself off to prevent damage because the unit has become too hot.
TenTwenty
Your boiler has lost the water pressure it needs to circulate heat around your home and has automatically shut down for safety.
TenTwenty
Your boiler has detected that it is positioned too close to a window or ventilation point, which poses a safety risk regarding airflow and flue gases.
TenTwenty
Your boiler is reporting a physical blockage or debris issue in the flue or drainage pipes, which is preventing it from venting exhaust gases safely.
TenTwenty
All models
3 Malvern boiler models
Boiler cover options
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.