Fault 55 Code 146 — Solar system not yet commissioned

What does Fault 55 146 mean?

The Worcester Bosch Greenstar CDi Boiler displays Fault 55 with code 146, indicating that the solar system has not yet been fully commissioned and is therefore not in operation.

• Solar system is not yet filled with heat transfer fluid
• Solar system has not been properly bled of air
• Commissioning procedure for the solar thermal system is incomplete

Click steps to track your progress.

1. 1

   Ensure the solar thermal system is fully filled with the appropriate heat transfer fluid.

2. 2

   Bleed the solar system thoroughly to remove all air pockets.

3. 3

   Follow the complete commissioning procedure for the solar thermal system as outlined in its documentation. If issues persist, contact a qualified heating engineer.