E9 277 — Safety temperature sensor measured temperature in excess of 95°c

What does E9 277 mean?

The safety temperature sensor has detected a temperature above 95°C. This is a critical safety measure to protect the boiler from overheating.

• Poor water circulation in the system.
• Faulty safety temperature sensor.
• Blocked heat exchanger.
• Pump failure.

Click steps to track your progress.

1. 1

   Turn off the boiler immediately and let it cool down.

2. 2

   Verify that the system pressure is adequate and top up if needed.

3. 3

   Ensure all radiator valves are open to promote circulation.

4. 4

   Contact a Gas Safe registered engineer to investigate the overheating issue.