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<Inspection procedure>
-Cooling and heating model-
Is it possible to start
unit by remote control?
Is it possible to detect
DC 15 − 60 V between
2 and 3 on terminal block?
Is crossover cable normal?
Is it possible to detect
AC 12 V on secondary side
(CN06) of transformer?
YES
YES
YES
YES
YES
Turn on power supply.
Does OPERATION
lamp blink?
YES
NO
NO
NO
Refer to 9-9 Troubleshooting
for Remote Control .
Connect crossover
cable properly.
NO
NO
NO
Replace outdoor
P.C. board.
Replace outdoor
P.C. board.
Replace outdoor
transformer.
NO
Check TA and TC sensors
or refer to 01 − 04 in Table 9-4-1.
Is it possible to detect
DC 5 V at Q60 and 12 V at Q50?
YES
Replace MG switch.
NO
Does MG switch operate?
(Next Page)
Is it possible to detect
AC 220 − 240 V at CN11?
Are TD and TE sensors normal?
(TD=17.9 kΩ at 50°C)
(TE=10 kΩ at 25°C)
YES
Replace sensors.
NO
Refer to item Power
can not be turned on .
All lamps on
indoor unit normal?
YES
NO
Refer to item 9-8-3 How to
check outdoor P.C. board.