29 — Open circuit at terminals 1 and L on Multi terminal of power pump module

What does 29 mean?

The boiler is in a hold/wait state due to an open circuit detected at terminals 1 and L of the power pump module's Multi terminal, indicating a connection issue.

• Loose or broken connection at terminals 1 and L on the power pump module
• Missing jumper or improperly installed safety equipment at the Multi terminal

Click steps to track your progress.

1. 1

   Ensure the main power supply to the boiler is turned off before attempting any inspection.

2. 2

   Visually check the connections at terminals 1 and L on the Multi terminal of the power pump module for any looseness or damage.

3. 3

   Verify that any required jumper or installed safety equipment is correctly in place on the Multi terminal.

4. 4

   If connections appear correct or the issue persists, contact a qualified heating technician for diagnosis and repair.