E110 flashing - Overheat or faulty thermostat

What does E110 (Flashing) mean?

The boiler's safety thermostat has activated, indicating an overheat condition or a fault with the thermostat itself. This can prevent the boiler from operating safely.

• Overheat thermostat operated
• Faulty overheat thermostat
• System water circulation issues
• Faulty flow/return sensors

Click steps to track your progress.

1. 1

   Allow the boiler to cool down completely for at least 30 minutes.

2. 2

   Check the system pressure on the boiler's gauge and ensure it is between 0.5 and 2.7 bar.

3. 3

   Verify that all radiator valves are open and that no blockages are preventing water circulation.

4. 4

   If E110 continues to flash after these steps, contact a qualified heating engineer.