E2 223 — Flow temperature sensor contacts interrupted

What does E2 223 mean?

The flow temperature sensor contacts have been interrupted. This means the boiler is not receiving any temperature feedback from the flow line.

• Loose or disconnected wiring to the flow temperature sensor.
• Damaged sensor wiring.
• Defective flow temperature sensor.

Click steps to track your progress.

1. 1

   Power cycle the boiler by turning off the main power for 30 seconds, then restart it.

2. 2

   Visually inspect the wiring connections to the flow temperature sensor to ensure they are secure.

3. 3

   If the issue continues, contact a qualified heating engineer to diagnose and repair the sensor or its wiring.