No rated voltage between S1 and S2 — Power supply issue or wiring fault

What does Rated voltage not present between S1 and S2 mean?

The expected rated voltage is not detected between the outdoor terminal block S1 and S2. This indicates a problem with the incoming power supply or the wiring to the unit.

• No power supplied to the unit
• Power supply wiring issue
• Faulty connection at the terminal block

Click steps to track your progress.

1. 1

   Check the main power supply to the unit.

2. 2

   Verify the wiring between the power source and the outdoor terminal block (S1, S2).

3. 3

   Ensure connections at the terminal block are secure and free of corrosion.

4. 4

   If voltage is confirmed at the source but not at the terminals, investigate the wiring.