BoilerFaultCodes
Evo Boiler Fault Codes
13 fault codes across 2 Evo boiler models — explained in plain English.
Evo boilers (built by Ideal for Wolseley).
Evo fault codes on this site
We document 13 fault codes across 2 Evo models, covering 11 distinct codes. Evo boilers use a mix of numbered codes and light or status indications. Codes for 2 of these models are taken directly from the manufacturer's own service or installation manual. Evo 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: HE 12, HE C22/30.
Just want the most common Evo problems?
The top 8 faults across the whole Evo range — causes, DIY checks, repair costs.
High-severity Evo fault codes
H9 L9 H9/L9 L E L A
Your boiler has shut down because the exhaust gases have reached a temperature that is too high, which is a safety feature to prevent damage to the system.
HE 12
Your boiler has sensed that the exhaust gases are getting too hot and has shut down as a safety precaution to prevent internal damage.
HE 12
Your boiler has shut down because the internal water temperature has become too hot, causing it to lock out for safety.
HE C22/30
Your boiler has failed to ignite after several attempts, meaning the system cannot provide heating or hot water until it is reset.
HE C22/30
Your boiler has failed to ignite after several attempts, meaning you will not have any heating or hot water until the system is reset or repaired.
HE C22/30
All models
2 Evo boiler models
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