Alarm 418 - Low defrosting flow

What does 418 mean?

The flow during defrosting is low. The display instructs to check the particle filter and pump. This hinders effective defrosting and can lead to ice build-up.

• Clogged particle filter in the heating medium system.
• Defective circulation pump (charge pump).
• Pressure drop in the heating system is too large.

Click steps to track your progress.

1. 1

   Switch off the Heat Pump's power. Carefully check and clean the particle filter in the heating medium system.

2. 2

   Verify that the circulation pump (charge pump) is operating correctly and not making unusual noises.

3. 3

   Ensure the system pressure is adequate and bleed the heating system to remove any trapped air.

4. 4

   If the problem persists, contact a qualified NIBE service technician to inspect the pump and system flow.