E28 Medium

Potterton E28 Fault Code

The Potterton E28 fault code means: your boiler has lost the ability to measure the temperature of your hot water, which usually means it will stop providing hot water or provide it at an inconsistent temperature.. It appears on 14 Potterton models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Hot Water NTC Fault

What causes the Potterton E28 fault?

This fault occurs when the internal sensor responsible for monitoring your hot water temperature has failed or is sending a broken signal to the main control board. The most common reason is that the sensor has physically degraded over time or developed a short circuit, preventing the boiler from knowing how hot the water is. In some cases, the issue may simply be a loose or corroded wire connection between the sensor and the boiler's computer.

Typical repair cost £90-160 (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 E28 fault code

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

Source

Potterton E28 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 31 August 2026