Fault 02 Code 42 — Internal fault, IPM code switch in intermediate position

What does Fault 02 42 mean?

The Worcester Bosch Greenstar CDi Boiler displays Fault 02 with code 42, indicating an internal fault where the code switch on the IPM (Intelligent Pump Module) is in an intermediate or incorrect position.

• The IPM code switch is not correctly set
• Improper configuration during installation or maintenance

Click steps to track your progress.

1. 1

   Turn off the boiler's main power supply.

2. 2

   Locate the IPM and check the position of its code switch.

3. 3

   Adjust the code switch to the correct, defined position as per the installation instructions.

4. 4

   Restore power to the boiler and observe if the fault clears. If not, contact a qualified heating engineer.