BoilerFaultCodesTechnical description
Deviation in the water pressure sensor/return temperature sensor
What causes this fault?
This fault occurs when the boiler detects a permanent difference between the temperature readings on the flow and return pipes. It usually happens because one of the internal sensors has failed, or because there is a physical blockage or pump issue preventing water from circulating evenly through the system.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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