BoilerFaultCodesPotterton E50 Fault Code
The Potterton E50 fault code means: your boiler is struggling to accurately detect the temperature of your hot water supply, so it has safely shut down to prevent overheating.. It appears on 10 Potterton models in our database.
Technical description: Hot Water NTC Fault
What causes the Potterton E50 fault?
This fault occurs when the sensor responsible for monitoring the temperature of your hot water fails to send a reliable signal back to the main control board. The most common reason is that the internal component of the sensor has degraded over time or developed an electrical short, preventing it from reading the water temperature accurately. In some cases, it can also be triggered by a loose or damaged connection in the wiring leading to the sensor.
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 E50 fault code
Click a model for the full fault code list and model-specific repair notes.
- Apollo Repair: £120-220
- Gold Combi ErP Repair: £90-£160
- Gold Combi HE Repair: £90-160
- Gold HE Repair: £90-160
- Heatmax Combi Repair: £120-200
- Promax Combi 28 HE Plus Repair: £90-160
- Promax Combi ErP Repair: £90-160
- Promax Combi HE Plus Repair: £90-160
- Promax System HE Plus Repair: £120-220
- Titanium Combi Repair: £120-200
Source
Potterton E50 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
- Potterton Apollo manual (PDF)
- Potterton Gold Combi ErP manual (PDF)
- Potterton Gold Combi HE manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026