Troubleshooting MLCAC-UTSM-2010-10
90 Outdoor Units
For console type(12K)
NO. Malfunction Running lamp Timer lamp Defrosting lamp
1
Communication malfunction between indoor and outdoor
units.
X ☆ X
2 Open or short circuit of T1 temperature sensor ☆ X X
3 Open or short circuit of T2 temperature sensor X X ☆
5 Indoor EEPROM malfunction ☆ ☆ X
6 IPM module protection ☆ X ☆
7 Open or short circuit of T3 or T4 temperature sensor ☆ ☆ ☆
8 Outdoor unit voltage protection ☆ ☆ O
9 Outdoor unit over-current protection ☆ O O
10 Top temperature protection of compressor ☆ O X
11
Inverter compressor drive protection
☆
◎ X
12 Fan Speed has been out of control. ☆ O ☆
O(light) X(off) ☆(flash at 5Hz) ◎(flash at 0.5Hz)
For console type(18K)
NO. Malfunction Running lamp Timer lamp Defrosting lamp
1
Communication malfunction between indoor and outdoor
units.
X ☆ X
2 Open or short circuit of T1 or T2 temperature sensor ☆ ☆ X
3 Fan motor malfunction. ☆ X ☆
4 Outdoor unit malfunction X X ◎
5 Indoor EEPROM malfunction ☆ ☆ ☆
X(off) ☆(flash at 5Hz) ◎(flash at 0.5Hz)
For compact 4-way cassette(18K)&ceiling & floor(18-60K)
NO. Malfunction Running lamp Timer lamp Defrosting lamp Alarm lamp
1
Communication malfunction between indoor and
outdoor units.
X ☆ X X
2 Open or short circuit of T1 or T2 temperature sensor ☆ X X X
3 Full-water malfunction X X X ☆
4 Outdoor unit malfunction X X X ◎
X(off) ☆(flash at 5Hz) ◎(flash at 0.5Hz)
For Normal 4-way cassette(18K-60K), For Duct type(18-60K)
NO. Malfunction
Running
lamp
Timer
lamp
Defrosting
lamp
Alarm
lamp
Display(nixie
tube)
1
Communication malfunction between indoor
and outdoor units.
X ☆ X X E1
2
Open or short circuit of T1 temperature
sensor
☆ X X X E2
3
Open or short circuit of T2 temperature
sensor
☆ X X X E3
4
Open or short circuit of T2B temperature
sensor
☆ X X X E4
5 Full-water malfunction X X X ☆ EE
6 Indoor EEPROM malfunction ◎ X X X E7
7 Outdoor unit malfunction X X X ◎ Ed
X(off) ☆(flash at 5Hz) ◎(flash at 0.5Hz)
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