When measuring, check the multimeter probe colour and the terminals to be measured as shown in the table below.
Fan controller
Multimeter probes
Resistance range
Red (+) - Black (-)
W
V
U
1
ON
2 3 4
HIC1
N
P2
S
R
DCL1
DCL2
T
1 2 3 4
102
(L3)
P1
LED501
P1 - R
P1 - S
P1 - T
R - N
S - N
T - N
P1 - U
P1 - V
P1 - W
U - N
V - N
W - N
1 kΩ and over
R - P1
S - P1
T - P1
N - R
N - S
N - T
U - P1
V - P1
W - P1
N - U
N - V
N - W
The resistance will gradually increase
after it
is between 1700 kΩ to 1900 kΩ
(*)
(*) Stay on for at least 30 seconds when measuring the following terminals.
< Initial DSW setting >
DSW1
1 2 3 4
OFF OFF OFF OFF
Regarding the DSW setting, do not change the original setting. If the settings are modified, transmission anomalies and fan
controller failure may occur.
(7) Method for checking the electronic expansion valve
Indoor unit electronic expansion valve Outdoor unit electronic expansion valve
Locked with fully closed
Check the temperature of the liquid pipe during the heating
operation. If the temperature does not increase, this is
abnormal.
It is not abnormal if the pressure of the liquid pipe does not
increase during the cooling operation.
Locked with slightly open
It is abnormal under the following conditions:
The temperature
of the freeze protection thermistor is
lower than the temperature of the suction air when the unit
under checking is stopped and other units are operating in
cooling.
Unit
Under
Checking
Electronic Expansion Valve
Freeze Protection
Ther
mistor
Other
Units
It is abnormal if the pressure of the liquid pipe does not
increase and the expansion valve outlet temperature
decreases after the cooling operation is started.
Locked with fully open
It is abnormal under the following conditions:
After heating
operation in the heating mode for longer than
30 minutes, the compressor discharge gas temperature is
not 10°C higher than the condensing temperature and there
are no other problems such as excessive refrigerant charge,
etc.
8 Troubleshooting
270
SMGB0065 rev. 1 - 12/2010
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