Boiler Error Codes Explained
What the code on your boiler's display actually means, which safe checks you can run yourself — pressure top-up via the filling loop, thawing a frozen condensate pipe, thermostat checks, one reset — and when the answer is a Gas Safe registered engineer. Code meanings vary slightly between model generations, so always check your manual's code table alongside these guides.
Qualified for gas: Boiler diagnosis and repair beyond the safe checks is assigned only to Gas Safe registered engineers, as the law requires for every gas appliance in the UK. Registration is checked against the Gas Safe Register before a job goes out, and you can repeat that check yourself from the ID card at the door.
Gas Safe registered & insuredHonest triage before we dispatchG3 certified for unvented cylindersFixed quotes after a proper survey
Worcester Bosch error codes
Vaillant error codes
Ideal error codes
Baxi error codes
Viessmann error codes
Glow-worm error codes
Alpha error codes
Potterton error codes
Carbon monoxide: what to watch for and how to respond — the warning signs on appliances, and why annual servicing is the main defence.