BoilerFaultCodesWhat the manual says
Manufacturer manualBurner in fault position. Supply voltage 230 V fault. Check the supply voltage and the internal fuses.
What causes this fault?
This fault occurs when the boiler's main control board detects an issue with the incoming electrical supply or its own internal power distribution. It is typically triggered by a sudden power surge that blows a safety fuse or an underlying hardware failure within the electronic circuitry. Without a stable 230V connection, the boiler cannot safely power the ignition process or the fan, leading to a complete shutdown.
This fault is frequently seen following heavy summer storms, as lightning strikes or local power grid fluctuations can cause the electrical surges that blow internal fuses.
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 E4: no call-out fees, no surprise bills.
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