BoilerFaultCodesTechnical description
Central heating return sensor error
What causes this fault?
This fault occurs when the internal control board loses communication with the sensor that monitors the temperature of the water coming back from your radiators. The most common reason is that the sensor itself has developed an electrical fault or the wiring connecting it to the main system has become loose or damaged.
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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