BoilerFaultCodesWhat the manual says
Manufacturer manualcheck the wiring harness
What causes this fault?
This fault happens when the boiler's internal sensors detect that the waste gases are not being cleared out of the flue safely or quickly enough. It is usually caused by a struggling fan, a blocked air tube, or a sensor that is failing to tell the brain of the boiler that it is safe to light the flame.
This issue can become more frequent during windy weather, as strong gusts can sometimes interfere with the pressure balance within the flue system.
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 29: no call-out fees, no surprise bills.
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