Earth Fault or Mains Reversal Emergency

Potterton Earth Fault or Mains Reversal Fault Code

Q: What does the Potterton Earth Fault or Mains Reversal fault code mean?

Your boiler has detected an electrical safety issue, likely caused by a wiring problem where the power connection is either incorrectly configured or not properly grounded.

Q: How much does it cost to fix Potterton error code Earth Fault or Mains Reversal?

Typical repair cost for the Potterton Earth Fault or Mains Reversal fault is £120-250 including labour.

Also written as EARTHFAULTORMAINSREVERSAL — same fault.

The Potterton Earth Fault or Mains Reversal fault code means: your boiler has detected an electrical safety issue, likely caused by a wiring problem where the power connection is either incorrectly configured or not properly grounded.. It appears on 5 Potterton models in our database.

Technical description: Status: Earth Fault or Mains Reversal. Green LED: FLASHING 2 Per Sec. Red LED: FLASHING 2 Per Sec.

Typical repair cost £120-250 (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 Earth Fault or Mains Reversal fault code

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

Source

Potterton Earth Fault or Mains Reversal 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