BoilerFaultCodesWhat the manual says
Manufacturer manualAppears on the display when filling water reaches 1.5 to 1.7 bar.
Shared across the Q 25CR range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
DIY fix possible
Check the boiler display to see if it automatically clears after a few momentsEnsure the filling loop valves are fully closed so no more water enters the systemRestart the boiler using the reset button if it does not resume normal operation automatically
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All 53 fault codes on the Q 25CR
Seeing a different code? Every code this model can display, in one place.