S.04 Low
Your boiler is operating normally and is currently firing the burner to provide central heating to your home.
Technical description: Heating mode – burner ignited
Typical repair cost: £0 (including labour)
DIY fix possible
No action is required as this is a status code, not an error.Adjust your thermostat or timer if you do not want the heating on.Wait for the boiler to reach the set temperature and the status will change.
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.04 — no call-out fees, no surprises.
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