Potterton E110 Fault

Potterton E110 Fault

The Potterton E110 error code indicates an overheat situation within the boiler. This condition occurs when the water temperature inside the boiler exceeds the maximum safe limit set by the manufacturer. An overheat condition can be triggered by several factors, each pointing to potential issues within the heating system that need addressing to ensure the boiler operates safely and efficiently.

Causes of Potterton E110 Error Code

  1. Faulty Thermostat: A malfunctioning thermostat may fail to regulate the boiler’s temperature properly, causing it to overheat.
  2. Blocked Heat Exchanger: Sludge or scale build-up in the heat exchanger can restrict water flow, leading to overheating as the heat cannot be dissipated effectively.
  3. Pump Failure: If the circulation pump is not working correctly, water may not circulate through the system properly, resulting in localized overheating.
  4. Restricted Water Flow: Closed valves, airlocks, or other obstructions in the system can reduce water flow, leading to an increase in temperature.

Troubleshooting and Resolving the Potterton E110 Error Code

  1. Check the Thermostat: Ensure the thermostat is functioning correctly. If it’s faulty, it may need replacing.
  2. Inspect the Heat Exchanger: Look for signs of sludge or scale. A professional system flush may be necessary to clear any blockages.
  3. Evaluate the Pump: Check the circulation pump to ensure it’s operating. Listen for any unusual noises and feel for warmth, indicating it’s working. A non-operational or faulty pump will need professional attention.
  4. Ensure Adequate Water Flow: Verify that all valves in the system are fully open. Bleed radiators to remove airlocks that could be impeding water circulation.
  5. Reset the Boiler: After addressing any issues, reset the boiler to clear the error code and reattempt operation. Consult the boiler manual for the specific reset procedure.
  6. Seek Professional Help: If the E110 error persists or you’re unable to diagnose the issue, it’s advisable to contact a Gas Safe registered engineer. A professional can safely identify and repair the cause of the overheating.


The Potterton E110 error code is a critical alert indicating that the boiler has overheated. Addressing this error involves checking and potentially repairing or replacing key components like the thermostat, heat exchanger, and pump. Due to the potential complexity of these issues and the importance of boiler safety, professional diagnosis and repair are often necessary. Regular maintenance can help prevent such problems, ensuring your boiler remains in good working order.