BoilerFaultCodesWhat the manual says
Manufacturer manualWater circulation volume self-test. The self-test for the water circulation volume is activated.
What causes this fault?
This status code appears when the boiler is performing a routine check to ensure the internal pump is moving water through the heat exchanger correctly. It is a protective measure to ensure the system doesn't overheat before the burner fires up fully. This is usually part of the boiler's normal start-up cycle rather than a component failure.
DIY fix possible
Wait for 5 to 10 minutes as this is often a temporary status code and not a permanent fault.Check that your radiator valves are open to allow water to circulate properly.Ensure the boiler pressure is in the green zone, typically between 1.0 and 1.5 bar.
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Affiliate links. We may earn a commission at no extra cost to you.