BoilerFaultCodesYour boiler is performing a routine cleaning cycle of the internal combustion chamber before or after it heats your home.
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: Pre-purge: before start-up, the boiler is purged for 4.2 seconds. Post-purge: when the heat demand has been met, the fan continues to operate for another 10 seconds.
What causes this fault?
This is a normal operational state where the boiler's internal fan runs to clear out any remaining gas or combustion by-products. It ensures the burner has a clean supply of air before it ignites and safely cools down the internal components once it has finished heating your water.
DIY fix possible
Check if the display returns to a standard temperature reading after 10 secondsMonitor the boiler to ensure it proceeds to fire up as normalNo action is required as this is a normal operating state
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