How much does it cost to fix Potterton error code Red LED on only?

Typical repair cost for the Potterton Red LED on only fault is £120-250 including labour.

Red LED on only High

Potterton Red LED on only Fault Code

Q: What does the Potterton Red LED on only fault code mean?

Your boiler has stopped working because it is not receiving the correct electrical signal or has blown an internal fuse required to power its main components.

Also written as REDLEDONONLY — same fault.

The Potterton Red LED on only fault code means: your boiler has stopped working because it is not receiving the correct electrical signal or has blown an internal fuse required to power its main components.. It appears on 2 Potterton models in our database.

Technical description: Check external controls/SW LIVE supply or internal fuse/overcurrent fault (Fan or Pump)

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 Red LED on only fault code

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

Source

Potterton Red LED on only 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