BoilerFaultCodesPotterton E50 Fault Code
The Potterton E50 fault code means: your boiler's temperature sensor for hot water has developed a fault, meaning the system may struggle to heat your water to the correct temperature.. It appears on 14 Potterton models in our database.
Technical description: Faulty components (referenced in fault finding section)
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.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Potterton models that show the E50 fault code
Click a model for the full fault code list and model-specific repair notes.
- Assure Combi / System Repair: £90-160
- Gold Combi HE Repair: £90-160
- Gold HE Repair: £90-160
- Promax Repair: £90-160
- Promax 15/2 HE Plus Repair: £120-220
- Promax Combi HE Plus Repair: £90-160
- Promax HE Repair: £90-160
- Promax HE Store Repair: £100-180
- Promax System HE Plus Repair: £90-160
- Sirius FS Repair: £120-220
- Sirius WH Repair: £120-200
- Suprima HE Repair: £120-200
- Titanium Repair: £120-180
- 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.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026