BoilerFaultCodesYour boiler has detected a problem with the sensor that monitors the temperature of the water returning from your radiators, meaning it may not be able to heat your home effectively.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Central heating return sensor error, possibly damaged
What causes this fault?
This fault occurs when the internal control board loses communication with the sensor that measures the temperature of water coming back from your radiators. The most common reason is that the sensor has physically failed due to age, or the electrical wiring connecting it to the main board has become loose or damaged.
This issue often becomes apparent in autumn when the heating is turned on for the first time after summer, as the sensor fails to respond to the sudden change in water temperature.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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