Samsung AM072FXVAFH series - Top Temperature Sensor

Troubleshooting
Samsung Electronics 4-77
4-4-33 : Suspension of starting due to Compressor discharge temperature sensor / Top temperature sensor
1.
How to check
Is the resistance
value normal for the
Compressor discharge Temperature sensor/
Top temperature sensor?
(Refer to “NOTE 1”)
Auto Trial Operation
Are all service valves open?
Are the Indoor Unit
and Outdoor Unit EEV normally
opera
ting?
Are there
any blockage inside the pipe?
(filter etc.)
Check the refrigerant amount.
Replace Compressor discharge temperat
-ure sensor / Top temperature sensor
Open the Service V
alve
Check the relevant EEV
Pipe inspection
Connect S-net and Manifold Gauge.
(essential requirement)
No
No
No
Yes
Yes
Yes
Yes
No
NOTE1
TOP1 : CN43 (3, 4)
TOP2 : CN45 (5, 6)
DIS1 : CN43 (1, 2)
DIS2 : CN45 (3, 4)
Resistance value
measure part
Resistance value
measure part
TOP1 TOP2
Temperature(°C) Resistance(K)
130
120
100
80
60
25
20
10
0
8.9
11.2
18.5
32.0
59.0
200.0
242.0
362.0
553.0
Outdoor unit display
Indoorunit display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation
Defrost TimerFan Filter/MPI
Operation
Defrost Timer Filter
Operation
TimerTurbo
××◑◑◑×◑◑◑ ● ◑◑
※ ● : ON ◑ : Flash ×: OFF
Judgment Method
 When value of Compressor discharge temperature sensor / Top temperature sensor is checked at 120ఁ or more.
Cause of problem
 Refrigerant shortage.
 Electronic expansion valve is blocked.
 Service valve blocked.
 Defective discharge temperature sensor.
 TOP temperature sensor defective.
 Blocked pipe
and defective.
 Discharge check valve leaking on outdoor unit that is off.