What the manual says
Manufacturer manualWater pressure in 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 pressure gauge on the front display against the manufacturer's recommended range (usually 1.0 to 1.5 bar).If the pressure is within the green zone, no action is required.If it is outside the recommended range, use the external filling loop to adjust the water pressure accordingly.
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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.