Reset button and fault indicator LED flashing — Appliance locked (Category 4 fault)

What does Reset button flashing, fault LED flashing mean?

For Category 4 faults on the Worcester Bosch Greenstar CDi Boiler, the appliance is disabled and locked. This is indicated by both the 'reset' button and the fault indicator LED flashing simultaneously.

• A critical internal fault has occurred, leading to appliance lockout
• The appliance requires manual intervention to restart after a severe fault

Click steps to track your progress.

1. 1

   Identify the specific fault code displayed alongside the flashing lights.

2. 2

   Press and hold the 'reset' button for 3 seconds, then release it.

3. 3

   The appliance should restart after releasing the button. Monitor if the fault reappears.

4. 4

   If the appliance repeatedly locks out, contact a qualified heating engineer to diagnose and rectify the underlying cause.