BoilerFaultCodesWhat the manual says
Manufacturer manualPeriodic safety check in progress
Shared across the 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
Wait for the boiler to complete the test (usually takes a few minutes)Check if the display returns to the normal temperature readingNo action is required unless the code remains on the screen for an extended period
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