Carrier 40MBFAQ Service Manual

40MBFAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
26
DIAGNOSIS AND SOLUTION (CONT.)
PC 04 (Inverter compressor drive error Diagnosis and Solution)
Description: An abnormal inverter compressor drive is detected by a special detection circuit, including a communication
signal detection, voltage detection, and compressor rotation speed signal detection.
Recommended parts to prepare:
• Connection wires
• IPM module board
• Outdoor fan assembly
• Compressor
• Outdoor PCB
Troubleshooting
NOTE: For certain models, the outdoor PCB cannot be removed separately. In this case, the outdoor electric control box should be replaced
as a whole.
Check the wiring between the
PCB and compressor.
Is it improperly wired?
YES
Check the IPM.
NO
Is it functioning
properly?
Replace the IPM board or
replace the outdoor PCB.
NO
Check the outdoor fan and
the outdoor unit ventilation.
YES
Is it functioning
properly?
Refer to “Fan Speed”
Malfunction.
NO
Check the compressor
resistance values.
YES
Are they within
acceptable parameters?
Replace the compressor .NO
Replace the outdoor PCB.
YES
Ensure proper connections or replace
the wires and connectors.

Carrier 40MBFAQ Specifications

General

Brand	Carrier
Model	40MBFAQ
Category	Heater
Language	English