S.27 Low
Your boiler is temporarily running the pump to circulate water and cool down the engine after it has finished heating.
Technical description: Pump overrun
Typical repair cost: £0 (including labour)
DIY fix possible
Check that the radiator valves are open to allow water to circulateMonitor the display to see if the status code changes to a normal heating modeEnsure there is enough water pressure in the system by checking the gauge
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.27 — no call-out fees, no surprises.
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