Codes vary by brand
There's no universal list. The same code can mean different things on different boilers, so always check your boiler's manual or the manufacturer's website for your exact model.
Common categories
Most fault codes relate to a few common areas:
- Ignition or flame failure
- Low water pressure
- Overheating
- Flue or fan problems
- Frozen or blocked condensate pipe
- Sensor or circuit board faults
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What you can safely do
Check the manual for user actions such as checking pressure or resetting once. Don't remove the casing or work on gas components. If the code returns, call a Gas Safe registered engineer and give them the make, model and code – it helps them bring the right parts.
