Fault 52 Code 124 — Temperature sensors T1 and T2 reversed

What does Fault 52 124 mean?

The Worcester Bosch Greenstar CDi Boiler displays Fault 52 with code 124, indicating that temperature sensors T1 and T2 have been reversed or swapped in their connections.

• Temperature sensor T1 and T2 connections are swapped
• Incorrect wiring during installation

Click steps to track your progress.

1. 1

   Turn off the power to the boiler and solar system.

2. 2

   Visually inspect the connections for temperature sensors T1 and T2.

3. 3

   Swap the connections if they are indeed reversed, ensuring each sensor is connected to its correct terminal.

4. 4

   Restore power and check if the fault clears. If it persists, contact a qualified heating engineer.