S.15 Low
Your boiler is briefly keeping the internal pump and fan running to clear away excess heat after you have finished using hot water.
Technical description: DHW mode pump and fan overrun
Typical repair cost: £0 (including labour)
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.15 — no call-out fees, no surprises.
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