COMFORT-AIRE Century VMH-SV Series Service Manual page 143

TS12-S: Inverter compressor drive error diagnosis and solution
Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication
signal detection, voltage detection, compressor rotation speed signal detection and so on.
Recommended parts to prepare:
• Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
• Outdoor PCB
Troubleshooting and repair:
Check the wiring between the
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
PCB and compressor.
Is it improperly wired?
NO
Check the IPM.
Is it functioning
properly?
YES
Check the outdoor fan and
the outdoor unit ventilation.
Is it functioning
properly?
YES
Check the compressor
resistance values.
Are they within
acceptable parameters?
YES
Replace the outdoor PCB.
Troubleshooting

Troubleshooting
Ensure proper connections or replace
YES
the wires and connectors.
Replace the IPM board or
NO
replace the outdoor PCB.
Please refer to "Fan
NO
Speed Malfunction"
NO Replace the compressor.
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