BoilerFaultCodesTechnical description
Error with flow/return temperature sensor temperature changing error
What causes this fault?
This fault occurs when the boiler's control board detects that the flow and return temperature sensors are reporting contradictory data, such as the return pipe being hotter than the flow pipe. The most common reason is that the sensors have been clipped onto the wrong pipes during a repair, or the internal sensors have developed a chemical fault and are sending incorrect electrical signals.
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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