BoilerFaultCodesWhat the manual says
Manufacturer manualBurner blocked. Burner control unit fault. Check the ignition electrodes and leads. Check whether a strong interference (EMC) field exists near the equipment. If the fault is not removed, replace the control unit.
What causes this fault?
This fault occurs when the boiler's internal computer experiences a critical communication error or fails to verify the ignition process. The most common reasons are worn-out spark electrodes that can no longer light the gas, or electrical 'noise' from nearby appliances interfering with the boiler's sensitive electronics.
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 Fd: no call-out fees, no surprise bills.
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