BoilerFaultCodesWhat the manual says
Manufacturer manualIgnition stage
What causes this fault?
This fault occurs when the boiler's internal sensors detect that the water coming back from your radiators is hotter than the water being sent out, which is physically impossible under normal conditions. The most common reason is that one of the temperature sensors has failed or is sending the wrong information to the control board. It can also happen if the pump is moving water in the wrong direction or if there is a significant blockage in the system's pipework.
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.
Avoid the next call-out bill
A cover plan would handle faults like é2: no call-out fees, no surprise bills.
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