BoilerFaultCodesYour boiler's hot water circulation pump is currently active based on its programmed timer settings.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: DHW circulation pump: ON according to time program
What causes this fault?
This is a status message rather than a mechanical failure, occurring when the boiler's internal clock triggers the secondary hot water pump to run. It indicates that the system is successfully moving hot water around your pipes so it is instantly available at your taps. You may see this code during your scheduled 'on' periods or if the pump has been manually boosted.
DIY fix possible
Check the hot water time program settings on your control panelAdjust the 'Circulation Pump' schedule if the pump is running when you do not need itMonitor the boiler to ensure it returns to standby once the scheduled period ends
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 73:0 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.