AC220-230V
C012
C013
14
• The voltage specification of the power circuit is as follo
wer circuit is as f
wer circuit is as f
ws.
<Check points>
Output
Voltage
Main load
Measuring points
Potential failure modes
spec.
+
–
12V
11-13V
MAIN P.W.B.
J28 (“0V” display)
LD301 blinks 3 or 4
times, then stops.
J25 (“12V” display)
J4 (“15V” display)
R23
5V
4.5-6V
MAIN P.W.B.
J20 (“5V” display)
J28 (“0V” display)
The unit won’t operate
MAIN P.W.B. error
B-12V
11-16V
Expansion valve
R25 (“B-12V” display)
R25 (“B-0V” display) LD301 blinks 5 times;
Expansion valve error
15V
14-17V
DC fan motor (CN24)
C06- side
LD301 blinks 3 times,
or 4 times, or 12 times.
MAIN P.W.B.
35V
33.5-38V Indoor unit electrical parts
R23(“D-0V” display)
J5(“15-0V” display)
Indoor unit won’t operate.
Indoor / Outdoor miss
conection.
(Ter
(T
(T minal C,D)
(“C-35V” display)
Terminal D (red line)
Reversing valve (CN2)
Terminal C (blown line)
• Check each voltage. If each voltage meets the voltage specification above, the power circuit is normal.
• If any error is found after checking, remove all loads and recheck each voltage.
If no error is found in this step, the power circuit is normal. Check the removed loads.
If any error is found in this step, the power circuit has any failure. Replace the MAIN
P
Replace the MAIN
Replace the MAIN .W
P
P .B.
A short-circuited load may cause an output error not only in the load but also in the others. Be sure to
check all outputs of the loads
k all outputs of the loads
k all outputs of the loads
Be sure to wait 15 minutes or more in order to discharge all the remaining voltage in the circuit to
connect/disconnect the wiring, other wise, the components may be damaged.
• The failures of the loads are as follows.
Failed
output
35V
15V
12V, 5V
12V
12V
Criterion
Connect the cable correctly.
correctly
correctly
Remove the connection cable and measure the
voltage. If the voltage is correct, check the electrical
parts for the indoor unit.
Remove the CN2 and measure the voltage. If the
voltage is correct, check the reversing valve.
Remove the CN24 and measure the voltage.
If the voltage is correct, check the DC fan motor.
this step.
Possible causes
Reversed connection of the cable.
Electrical part for the indoor unit has
a failure.
Short-circuited reversing valve
DC fan motor error
Main P.W.B. error
Also, check the main P.W.B. 1A fuse for blow out in
Check the main P.W.B.
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