Electrical Supply Fault High

Potterton Electrical Supply Fault Fault Code

Also written as ELECTRICALSUPPLYFAULT — same fault.

The Potterton Electrical Supply Fault fault code means: your boiler is not receiving the steady electrical voltage it needs to safely fire up and run.. It appears on 2 Potterton models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Lockout. Boiler requires permanent live and switched live (minimum 190V). Check for reversed polarity or fuse issues.

What causes the Potterton Electrical Supply Fault fault?

This fault occurs when the boiler's internal computer detects that the incoming electricity is too weak or unstable to power the safety components. The most common reasons are a loose connection in the wall socket wiring, a failing printed circuit board, or a wider issue with the power grid entering your home.

This fault is more common during winter or periods of extreme weather when the national grid is under heavy load, which can lead to slight drops in local voltage.

Typical repair cost £120-280 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Potterton models that show the Electrical Supply Fault fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Potterton Electrical Supply Fault fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026