BoilerFaultCodesWhat the manual says
Manufacturer manualComfort protection: Minimum load, loss of flame. Comfort protection mode for flame loss at minimum load is activated.
What causes this fault?
This fault occurs when the boiler struggles to maintain a steady flame while running at its lowest power level. The most common cause is a dirty or worn-out sensing probe that can no longer accurately detect the fire, or an incorrect mix of gas and air preventing a consistent burn.
DIY fix possible
Check that the gas supply is active and credit is on the meterPress the 'Reset' button (flame symbol) to clear the statusMonitor the boiler to see if the code returns or leads to an F.28 or F.29 faultContact a Gas Safe engineer if the problem persists for a full service and ionisation check
Avoid the next call-out bill
A cover plan would handle faults like S.46: no call-out fees, no surprise bills.
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Related fault codes
All 146 fault codes on the ecoTEC pro 24 VUW GB 246/5-3
Seeing a different code? Every code this model can display, in one place.