BoilerFaultCodesWhat the manual says
Manufacturer manualignition
What causes this fault?
This fault occurs when the boiler's internal computer detects that water isn't moving through the system quickly enough to safely start the burner. It is usually caused by a failing circulation pump that can't push the water round, or a blocked heat exchanger that is restricting the flow. Essentially, the boiler stays in a holding pattern to prevent itself from overheating during the ignition phase.
This issue often surfaces in autumn when the heating is turned back on after a long summer break, as pump components can seize up during periods of inactivity.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like S.23: no call-out fees, no surprise bills.
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