Locking fault 0/y/ (2/8/5) - Return temperature sensor detected over 203°F (95°C)

What does 0/y/ mean?

The boiler's return temperature sensor has measured a temperature higher than 203°F (95°C). This can affect the heating performance. This is a locking fault, meaning the boiler will try to resume normal operation once the temperature drops.

• Return temperature sensor reading too high (over 203°F/95°C)

Click steps to track your progress.

1. 1

   Verify that the heating system circulation is not restricted.

2. 2

   Ensure the return pipes are not unusually hot to the touch.

3. 3

   If the issue persists, contact a qualified service technician to inspect the sensor or system circulation.