BoilerFaultCodesTechnical description
Discharge gas sensor failure
What causes this fault?
This fault occurs when the boiler's internal computer loses communication with the sensor that measures the temperature of the exhaust gases. The most common reason is that the sensor has developed an electrical fault or the wiring connecting it to the main control board has become loose or damaged. To ensure the appliance doesn't overheat or become unsafe, the boiler will automatically stop firing until the part is replaced.
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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