Fault 02 Code 43 — Internal fault, coding switch position changed

What does Fault 02 43 mean?

The Worcester Bosch Greenstar CDi Boiler displays Fault 02 with code 43, indicating an internal fault where the coding switch position has been changed since the initialisation phase.

• Coding switch position altered after initial system setup
• Incorrect coding applied to the system

Click steps to track your progress.

1. 1

   Turn off the boiler's main power supply.

2. 2

   Review the system documentation for the correct coding switch settings.

3. 3

   Correct the coding position on the relevant component.

4. 4

   Restart the boiler and monitor for the fault. If it persists, contact a qualified heating engineer.