BoilerFaultCodesTechnical description
Return temperature sensor interruption
What causes this fault?
This fault occurs when the boiler's control board can no longer read the temperature of the water coming back from your radiators. This is usually caused by the internal sensor failing due to age, or a loose connection in the wiring that prevents the signal from reaching the main computer.
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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