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