D1 241 — Boiler return temperature sensor contacts interrupted

What does D1 241 mean?

The contacts of the boiler return temperature sensor have been interrupted. This means the boiler is not receiving proper temperature feedback from the return line.

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