49
3-12 MCU/MCU subcooler entrance/exit sensor error (Open/Short)
1.
Cause of problem
Is the sensor connector connected
on the PCB ?
Is the resistor value matching with
“NOTE1” table?
Separate the connector from the PCB and
measure the resistance value
between the 2 terminals.
Restart operation after replace the PCB
Restart operation after
connecting the connector to PCB
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
∙ Refer to the judgment method below.
Cause of
problem
∙ MCU/MCU subcooler entrance/exit sensor is open/short
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