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2023 Warmflow Boiler Error & Fault Codes


A boiler is a time tested and safe method of heating your home or business. Warmflow boilers are no exception to that rule. These boilers are tried and true for many customers. They are reliable and safe to operate. However, they can still give you problems from time to time. That’s where n error code list comes in handy. Maybe you have seen a glowing red light on your boiler control panel, or even heard it operating but the room doesn’t warm up at all. You need to use this list of error codes to determine what the problem is and take steps to address it.

It’s important to know and understand the error codes on your Warmflow boiler. Error codes display in blue or red text depending on whether it’s a warning or an error. Knowing these error codes will help you to inform the technical support team at Warmflow what is wrong with your boiler. The engineer will then be able to resolve the issue for you quickly and simply, allowing you peace of mind that your heating system is once again working properly.

Sometimes boilers just need to be reset but sometimes they can be pointing at more serious problems. Here's a guide to most of the Warmflow error codes you could get.

Fault Code Behaviour
E01No flame – flame has failed during startup.
E02Safety thermostat tripped (95°C)
E03Flue thermofuse tripped
H20Low system pressure
E05Heating sensor fault
E22Fan fault
E16Parameter programming request
E35Ionisation electrode fault
E42Fan printed circuit board (PCB) fault
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Table of Contents


  1. Warmflow Error Codes

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