What does E430/166 mean?

The boiler's water pressure test (either temporary or final) has failed, indicating a problem with the system's water circulation or pressure.

• Poor water circulation.
• Blocked or jammed pump.
• Incorrect water pressure in the system.

Click steps to track your progress.

1. 1

   Check the system water pressure on the boiler's gauge and re-pressurize if too low.

2. 2

   Ensure all heating system valves are fully open.

3. 3

   If the error persists, a qualified technician should check the water circulation and the pump.