How much does it cost to fix Potterton error code E83485?

Typical repair cost for the Potterton E83485 fault is £120-280 including labour.

E83485 High

Potterton E83485 Fault Code

Q: What does the Potterton E83485 fault code mean?

Your boiler has sensed that parts of the system have become too hot and has shut itself down as a safety precaution.

The Potterton E83485 fault code means: your boiler has sensed that parts of the system have become too hot and has shut itself down as a safety precaution.. It appears on 1 Potterton model in our database.

Technical description: Overheat Thermostat

What causes the Potterton E83485 fault?

This fault occurs when the internal water temperature exceeds safe limits, triggering a safety sensor to cut the power. The most common reasons are a failed water pump that isn't moving heat away from the boiler quickly enough, or a build-up of debris and sludge that is restricting the flow within the main heat exchanger.

This fault is more frequent when the heating is first turned on after summer, as pump components can seize during long periods of inactivity.

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 E83485 fault code

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

Powermax HE Repair: £120-280

Source

Potterton E83485 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