S.02 Low
Your boiler is currently preparing for heating by circulating water, but it has not yet fired the burner to create heat.
Technical description: Heating mode error – water pump running
Typical repair cost: £0-80 (including labour)
DIY fix possible
Check that your room thermostat or programmer is set to a high enough temperature to trigger heatEnsure all radiator valves are openWait up to 10 minutes to see if the code changes to a 'running' status (S.04)
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.02 — no call-out fees, no surprises.
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Parts commonly replaced
- External Thermostat
- Pump
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