E425 — Reverse phase or open phase (3-phase)

What does E425 mean?

The 3-phase power supply to the outdoor unit has a reverse phase (incorrect phase sequence) or an open phase (one or more phases missing).

• Incorrect wiring of the 3-phase power supply (reversed)
• Disconnection or loss of one of the 3 power phases (opened)
• Faulty electrical connection or breaker

Click steps to track your progress.

1. 1

   Immediately power off the outdoor unit at the main circuit breaker.

2. 2

   Do NOT attempt to operate the unit with this error as it can cause severe damage.

3. 3

   Contact a qualified electrician to inspect and correct the 3-phase power wiring and connections.