BoilerFaultCodes
Warmflow Boiler Fault Codes
69 fault codes across 6 Warmflow boiler models — explained in plain English.
Northern Irish manufacturer specialising in oil boilers.
Warmflow fault codes on this site
We document 69 fault codes across 6 Warmflow models, covering 38 distinct codes. Warmflow boilers use letter-and-number codes such as E01, E02, E04. Codes for 6 of these models are taken directly from the manufacturer's own service or installation manual.
Models covered: Agentis Internal, Kabin Pak and Utility, Agentis External, Agentis Boilerhouse, B-series and Bluebird, 70/90 Combi.
Just want the most common Warmflow problems?
The top 8 faults across the whole Warmflow range — causes, DIY checks, repair costs.
High-severity Warmflow fault codes
E01 E02 E04 E05 E06
Your boiler's burner has stopped working because it cannot light the fuel, meaning your heating and hot water have turned off for safety.
Agentis Internal
Your boiler has overheated, causing a safety switch to trigger and shut down the system to prevent damage.
Agentis Internal
Your boiler has detected that there is not enough water pressure in the system to operate safely, which is often caused by a small leak or after bleeding your radiators.
Agentis Internal
Your boiler has lost its ability to monitor the temperature of the water leaving the unit, meaning it cannot operate safely to provide heating or hot water.
Agentis Internal
Your boiler's hot water sensor has stopped working correctly, which means the system cannot safely monitor the temperature of the water going to your taps.
Agentis Internal
All models
6 Warmflow boiler models
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