Temperature Limiter (FD1) Tripped — Overheating detected, power cut to electrical addition

What does FD1 Tripped mean?

The heat pump's temperature limiter (FD1) has activated, cutting power to the electrical heating element. This happens if the internal temperature rises between 90°C and 100°C, indicating an overheating condition. It requires a manual reset.

• Internal temperature exceeded safe limits (90-100°C)
• Possible system fault causing overheating or insufficient water flow
• Tripped during transportation or initial installation

Click steps to track your progress.

1. 1

   Cut the main current to the heat pump at the circuit breaker for safety.

2. 2

   Access the temperature limiter (FD1) located behind the front cover.

3. 3

   Press the reset button (FD1-SF2) with a small screwdriver.

4. 4

   Restore power to the heat pump at the circuit breaker.

5. 5

   If the problem persists or the limiter trips again, contact a qualified electrician to investigate the cause of overheating.