33 — Power supply voltage below minimal operation level or internal fuse failure

What does 33 mean?

The boiler is in a hold/wait state because the power supply voltage is too low for minimal operation, or an internal fuse has failed.

• Insufficient or fluctuating power supply to the boiler
• Blown internal fuse within the control unit
• Faulty control unit

Click steps to track your progress.

1. 1

   Check your home's electrical panel to ensure the circuit breaker for the boiler has not tripped.

2. 2

   If other electrical appliances in your home are experiencing power issues, contact your electricity provider.

3. 3

   If the power supply seems stable, contact a qualified heating technician to check the internal fuse and the boiler's control unit.