BoilerFaultCodesYour boiler is preparing to ignite by clearing out the combustion chamber, which is a normal part of its startup process.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Boiler in pre-purge mode
What causes this fault?
This code appears when the fan starts spinning to push fresh air through the system and clear out any leftover gases from the previous cycle. It is a vital safety step that ensures the combustion chamber is clean and ready for a fresh flame to light safely. Once the air has been purged for a few seconds, the boiler will naturally move to the next stage of the ignition process.
DIY fix possible
Wait for the boiler to complete its checking cycleEnsure there is a demand for heat from your thermostatCheck that the gas supply is turned on if the code persists without ignition
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A boiler cover plan would cover faults like 1 — no call-out fees, no surprises.
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