Samsung AM038KXWDCH, Service Manual, Page: 102 / 295

Troubleshooting
Samsung Electronics 99
4-3-16 MCU/MCU subcooler entrance/exit sensor error (Open/Short)
1. Cause of problem
Is the sensor connector connected
on the PBA ?
Is the resistor value matching with
“NOTE1” table?
Separate the connector from the PBA and
measure the resistance value
between the 2 terminals.
Restart operation after replace the PBA
Restart operation after
connecting the connector to PBA
Replace this part as it is
the defective itself.
No
No
Yes
Yes
Yes
NOTE1
Temperature(°C) Resistance(KΩ)
70
60
50
40
30
20
10
0
-10
2.2
3.0
4.2
5.8
8.3
12.1
18.0
27.3
43.0
Outdoor unit
display
(MCU subcooler)
(MCU)
Indoorunit
display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation Defrost Timer Fan Filter/MPI Operation Defrost Timer Filter Operation Timer Turbo
× × ◑ ◑ ◑ × ◑ ◑ ◑ ● ◑ ◑
※ ● : ON ◑ : Flash ×: OFF
Judgment
Method
- Detect according to temperature detected with the MCU / MCU subcooler entrance/exit pipe temperature thermistor.
Cause of
problem
- MCU / MCU subcooler pipe entrance/exit sensor is defective. (open/short)
4-3 Appropriate Measures for Different Symptom (cont.)