BoilerFaultCodesWhat the manual says
Manufacturer manualPower supply <170V
What causes this fault?
This fault occurs when the electrical voltage entering the boiler drops to a level so low that the internal components can no longer function. The most common reason is a problem with the local power grid or an issue with your home's electrical wiring, though a failing main control board can also misread the incoming power.
This fault is more common during extreme cold snaps or heatwaves when the national grid is under heavy strain, leading to temporary 'brownouts' or voltage fluctuations.
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 17: no call-out fees, no surprise bills.
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