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How to check mis-wiring and serial signal error (when outdoor unit does not work)
E
Yes
Repair wiring.
Is there 20V DC between both ends of R132 when
relay (52C) turns ON?
(By tester, the stylus is between 0 ~ 20V.)
Yes
•Turn OFF power supply.
•Connect ON in-out connecting wire.
•Turn ON power supply.
3 minutes later, when EMERGENCY OPERATION switch is pressed
and 52C relay turns ON, is there 220-240V AC between outdoor ter-
minal block
and
?
2
N
Yes
3 minutes later, when EMERGENCY OPERATION switch is pressed
and 52C relay turns ON, is there 5V DC between J9
Yes
3 minutes later, when EMERGENCY OPERATION switch is pressed
and 52C relay turns ON, is there 10V DC between both ends of
R601?
(By tester, the stylus is between 5 ~10V DC)
Yes
Replace the outdoor DEICER P.C. board.
1. Turn OFF power supply.
2. Turn ON power supply.
3. Press EMERGENCY OPERATION switch.
3 min. later, when relay 52C turns ON, what self-check result is
displayed on OPERATION INDICATOR lamp indoor unit?
Is there mis-wiring, poor contact, or wire disconnection?
1. Turn OFF power supply and disconnect in-out connecting wire on indoor side.
2. Short-circuit between indoor terminal block
3. Turn ON power supply and press EMERGENCY OPERATION switch.
No
-J8
?
+
–
Start
w
1
Mis-wiring is indicated.(1-sec.ON,1-sec.OFF)
No
and
.
N
3
No
No
No
49
w 1 Short circuit of JPG and JPS on the
electronic control P.C. board enables
self-check to be displayed in 3 seconds.
Serial signal error is indicated.
(1-sec.ON, 2.5-sec.OFF)
Replace the indoor electronic control
P.C. board.
Rectify in-out connecting wire.
Check and rectify fuse and varistor on out-
door DEICER P.C. board.
Rectify in-out connecting wire.
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