Mcu/Mcu Subcooler Entrance/Exit Sensor Error (Open/Short) - Samsung AM080FX A Series Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)

4-3-16 MCU/MCU subcooler entrance/exit sensor error (Open/Short)

Outdoor unit
display
Duct, Cassette (1/2 Way),Console, Celing
Operation Defrost
Indoorunit
×
display
※ ● : ON ◑ : Flash ×: OFF
Judgment
- Detect according to temperature detected with the MCU / MCU subcooler entrance/exit pipe temperature thermistor.
Method
Cause of
- MCU / MCU subcooler pipe entrance/exit sensor is defective. (open/short)
problem
1. Cause of problem
Is the sensor connector connected
Separate the connector from the PBA and
measure the resistance value
Is the resistor value matching with
Restart operation after replace the PBA
Samsung Electronics
(MCU subcooler)
(MCU)
Timer Fan Filter/MPI Operation Defrost
× ◑ ◑
on the PBA ?
Yes
between the 2 terminals.
Yes
"NOTE1" table?
Yes
Cassette (4/Mini4 Way)
◑ × ◑
No
Restart operation after
connecting the connector to PBA
No
Replace this part as it is
the defective itself.
Wall-mounted (NeoForte)
Timer Filter Operation
◑ ◑ ●
NOTE1
Temperature(°C)
70
60
50
40
30
20
10
0
-10
Timer Turbo
◑ ◑
Resistance(KΩ)
2.2
3.0
4.2
5.8
8.3
12.1
18.0
27.3
43.0
171