38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
72
DIAGNOSIS AND SOLUTION (CONT)
Communication malfunction between adapter board and outdoor main control board (ODU Ed)
Troubleshooting
Main Parts
1. Temperature Sensor Checking
Disconnect the temperature sensor from PCB, measure the resistance value with a tester.
Fig. 47 — Tester
Temperature Sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor discharge temp.(T5) sensor.
Measure the resistance value of each winding by using the multi-meter.
ERROR CODE
P2/ODU P0/PC 02
MALFUNCTION DECISION
CONDITIONS
If outdoor PCB does not receive feedback from adapter board
SUPPOSED CAUSES
Wiring mistake
Faulty PCB
YES
Power off, then restart the unit after 3
minutes.
Does the error still exist?
Replace the outdoor
main control board
Does a problem remain? The unit is operating normally
NO
Check the wirings and connections
YES
Are all the
connections good?
Ensure proper connections
NO
YES
Replace the adapter main PCB
Problem solvedNO
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