BoilerFaultCodesWhat the manual says
Manufacturer manualBurner ignited
What causes this fault?
This is not actually a fault, but a status message indicating that the boiler’s internal sequence is progressing correctly. It appears when the gas gas has successfully ignited and the burner is currently producing heat for your radiators or hot water. If your boiler seems stuck on this code without producing heat, it may be waiting for a signal from the thermostat or internal sensors.
DIY fix possible
No action is required as this is a status code, not an error.Monitor the boiler to ensure it transitions to other 'S' codes as demand changes.If the code persists without heating being delivered, check that your thermostat is turned up.
Avoid the next call-out bill
A cover plan would handle faults like S.4: no call-out fees, no surprise bills.
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Related fault codes
All 135 fault codes on the ecoTEC plus 612 R1 VU GB 126/3-5
Seeing a different code? Every code this model can display, in one place.