Samsung Electronics
70
6-5 Fault Diagnosis of Major Parts
Preparation : multimeter (AC voltage, DC voltage, Resistance)
Indoor
Temperature sensor
Heat exchanger in/out sensor
Outdoor
Temperature sensor Condenser
temperature sensor
Outdoor
Discharge temperature sensor
OLP temperature sensor
Indoor Fan Motor
Outdoor Fan Motor
Outdoor unit EEV
Stepping motor
Crank case heater
Indoor unit step motor
Flap, Front panel
Measure the resistance between terminals of the sensor connector housing.
In case of outdoor unit sensor, "view mode" is used for checking sensor temperature.
In case of Indoor temperature sensor, temperature is displayed on the display unit in
"Fan Mode" operation.
Normal
Abnormal
∞
, 0
Ω
...open or short
Measure the resistance between terminals of the sensor connector housing.
In case of outdoor unit sensor, "view mode" is used for checking sensor temperature.
Normal
Abnormal
∞
, 0
Ω
...open or short
Measure the resistance between terminals of the Motor connector housing
Normal
At the normal temperature (10˚C - 30˚C)
Abnormal
∞
, 0
Ω
...open or short
Measure the resistance between terminals of the Motor connector housing
Normal
Abnormal
∞
, 0
Ω
...open or short
Measure the resistance between terminals of the Motor connector housing
Normal
40-50
Ω
Orange-Gray, Red-Gray, Yellow-Gray, Black-Gray
Abnormal
∞
, 0
Ω
...open or short
Measure the resistance between terminals
Normal
1.1-1.3K
Ω
Abnormal
∞
, 0
Ω
...open or short
Measure the resistance between terminals of the Motor connector housing
Normal
Abnormal
∞
, 0
Ω
...open or short
Diagnosis
Part
Ambient temperature
15˚C
20˚C
25˚C
30˚C
25˚C
40˚C
Resistance of sensor[K
Ω
]
14.7
12.1
10
8.3
6.9
5.8
Ambient temperature
0˚C
10˚C
20˚C
30˚C
40˚C
50˚C
Resistance of sensor[K
Ω
]
553
362
242
166
165
82
Terminals(wire color)
Resistance[
Ω
]
Remark
MH026FPEA
MH035FPEA
MH052FPEA
Yellow-Blue
250~280
250~280
120~150
Main
Yellow-Red
420~480
330~370
120~150
Sub
Terminals(wire color)
Resistance[
Ω
]
Remark
Red-Blue
95~105
Main 1
Yellow-Blue
95~105
Main 2
Blue-White(run capa line)
60~75
Sub
Red-White Blue(run capa line)
0~1
Thermal fuse
Motor
Resistance[
Ω
]
Terminals(wire color)
Flap
280~320
Red-Yellow, Red-Orange,
Front panel
110~130
Red-Blue, Red-Pink
DB98-20241A(2)_2 05/1/25 5:07 AM Page 70
