Error Code 18 — Compressor out of synchronism

What does 18 mean?

The compressor's internal windings are losing synchronization during speed changes. This can happen when speeding up or slowing down the compressor.

• Unstable power supply
• Internal compressor fault
• IPM fault
• Incorrect compressor terminal wiring
• Poor or loose wiring connections

Click steps to track your progress.

1. 1

   Check for a stable power supply to the unit.

2. 2

   Inspect the compressor terminal wiring for correctness.

3. 3

   Ensure all wiring connections are tight and secure.

4. 4

   Check if the IPM is functioning correctly.