Magnetic Coupling Switching

Magnetic Coupling switching

1. Check voltage at compressor plug.
Voltage present
- Replace magnet coil.

No voltage present
- Check low-pressure switch.

2. Check voltage at low-pressure switch.
Voltage only at one pin
- Check system fill quantity.
System correctly filled
- Replace low-pressure switch.
No voltage present
- Check A/C relay.

3. Check A/C relay.
There must be voltage at term. 3.
No voltage present
- Check de-icer.
There must be no ground potential at term. 2.
Ground present
- Check water-temperature switch.

4. Check voltage at de-icer.
Voltage at only one pin
- Replace de-icer.
No voltage
- Replace control switch.