Malfunction (Parts) Check Method - IVT 12PHR-N Service Manual

12PHR-N

[6] MALFUNCTION (PARTS) CHECK METHOD

1. Procedure for determining defective outdoor unit IPM/compressor
The following flow chart shows a procedure for locating the cause of a malfunction when the compressor does not start up and a DC
overcurrent indication error occurs.
Connect power cord
to AC outlet.
Check 220-240 VAC
between (1) and (N)
on outdoor unit PWB.
YES
Is LED1 on outdoor
unit flashing?
YES
Using remote control,
operate air conditioner
so that compressor
starts.
Compressor starts up.
Immediately
after startup
Does LED1 indicate
DC overcurrent error?
NO
Does LED1 indicate
rotation error?
NO
Normal
CAUTION: Please take care for electrical shock when you work to change defective parts or disconnect wires of defective application.
The outdoor unit has energy changed for a while even after unplugging the power supply cord.
After changing the part or unit, please retry check procedure from the beginning.
12PHR-N_S530612PHRN.indd 8
No
NO (unlit)
Does LED1 remain lit?
Check 320 VDC between
pins IPM (20) and (24)?
YES
Serial signal error.
FUSE and+12 V, +15 V,
Check inter-unit wiring.
+18V on PWB
Check indoor and
outdoor unit PWBs.
Replace outdoor unit PWB.
Replace expansion valve.
YES
Replace outdoor unit
PWB.
Check compressor.
2/3-way valve closed.
Refrigerant shortage.
YES
Replace outdoor unit PWB.
NO
Replace compressor.
NO
Disconnect (CN3) lead
wires of FAN motor.
YES
NO
Disconnect (CN12)
expansion valve.
YES
(LED1 is still off)
YES
LED1 is flashing.
3-8
Replace outdoor unit PWB.
NO
LED1 is flashing.
YES
Replace FAN motor.
NO
Replace outdoor unit PWB.
2013/8/7 15:42:16