Midea MISSION2 3D INVERTER Series, Service Manual

Page: 105 / 113

Tr
oubleshooting
 Page 101 
5.14 Zero speed protection of compressor/ outdoor fan or lack of phase of compressor or
outdoor fan/Compressor speed malfunction diagnosis and solution
Recommended parts to prepare:
• Wiring mistake
• Faulty fan assembly faulty
• Faulty fan motor
• Faulty PCB
• Faulty compressor
Troubleshooting and repair:
Check the wiring between the PCB
and compressor.
Check the wiring between the PCB
and compressor.
Is it improperly wired?
Is it improperly wired?
Ensure proper connections or replace
the wires and connectors.
Ensure proper connections or replace
the wires and connectors.
YES
NO
Check the outdoor fan and the
outdoor unit ventilation.
Check the outdoor fan and the
outdoor unit ventilation.
Is it functioning
properly?
Is it functioning
properly?
Please refer to “Fan Speed
Malfunction”
Please refer to “Fan Speed
Malfunction”
NO
Check the compressor
resistance values.
Check the compressor
resistance values.
YES
Are they within
acceptable parameters?
Are they within
acceptable parameters?
Replace the compressor.
Replace the compressor. NO
Replace the outdoor PCB.
Replace the outdoor PCB.
YES