Fault Code Library
Combi Boiler Error Codes
Find your boiler's brand below to decode the fault on your display — what it means, what causes it, and what's safe to do before a licensed technician arrives. 189+ codes across 14 brands.
This is not a DIY repair
Combi boilers are gas-fired appliances regulated under the BC Safety Standards Act. Opening the unit, touching the gas valve, or working on the flue without a valid BC gas-fitter licence is both unsafe and illegal. Diagnosing the fault is helpful — fixing it should always be left to a certified technician.
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A code is a clue, not a fix
Fault codes tell you which system the boiler is unhappy with, which speeds up an accurate repair. But because combi boilers are gas appliances, the actual repair must be carried out by a licensed gas fitter. Use these pages to understand the problem — then call us to fix it safely.