D.72 Low
Your boiler is continuing to run its internal pump for a short period after heating your water to ensure it cools down safely and efficiently.
Technical description: Pump overrun time after warm start
Typical repair cost: £0-80 (including labour)
DIY fix possible
Check that at least one radiator valve (the bypass radiator) is fully openMonitor the boiler to see if the code clears automatically after a few minutesEnsure the system water pressure is between 1.0 and 1.5 bar on the digital display
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.72 — no call-out fees, no surprises.
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Parts commonly replaced
- None (Adjustment only)
- Bypass valve
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