How much does it cost to fix Potterton error code E05?

Typical repair cost for the Potterton E05 fault is £90-160 including labour.

E05 High

Potterton E05 Fault Code

Q: What does the Potterton E05 fault code mean?

Your boiler's temperature sensor responsible for your heating system has developed a fault, meaning the boiler cannot accurately measure how hot the water is.

The Potterton E05 fault code means: your boiler's temperature sensor responsible for your heating system has developed a fault, meaning the boiler cannot accurately measure how hot the water is.. It appears on 5 Potterton models in our database.

Technical description: Central heating flow NTC sensor fault

What causes the Potterton E05 fault?

This fault occurs when the sensor responsible for monitoring the temperature of the water leaving your boiler fails to send a correct electrical signal. The most common reason is that the internal component of the sensor has degraded over time or developed a short circuit, preventing the boiler from safely knowing how hot it is. In some cases, the issue may also be caused by loose or corroded wiring connecting the sensor to the main control board.

Typical repair cost £90-160 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Potterton models that show the E05 fault code

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

Source

Potterton E05 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