Midea MOU-12HDN1, Service Manual

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MLCAC-UTSM-2010-10 Troubleshooting
Outdoor Units 89
10.1.2 Troubleshooting
For compact 4-way cassette(12K)
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 temperature sensor ☆ X X X
3 Open or short circuit of T2 temperature sensor X X
☆
X
4 Full-water malfunction X X X ☆
5 Indoor EEPROM malfunction
☆ ☆
X X
6 IPM module protection ☆ X X O
7 Open or short circuit of T3 or T4 temperature sensor
☆
O X X
8 Outdoor unit voltage protection
☆
O X O
9 Outdoor unit over-current protection ☆ ☆ X ☆
10 Top temperature protection of compressor
☆
X O X
O(light) X(off) ☆ (flash at 2.5Hz) ◎ (flash at 0.5Hz)
For ceiling & floor(12K),
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 temperature sensor
☆
X X X
3 Open or short circuit of T2 temperature sensor X X
☆
X
4 Full-water malfunction X X X
☆
5 Indoor EEPROM malfunction
☆ ☆
X X
6 IPM module protection
☆
X X O
7 Open or short circuit of T3 or T4 temperature sensor ☆ O X X
8 Outdoor unit voltage protection
☆
O X O
9 Outdoor unit over-current protection ☆ ☆ X ☆
10 Top temperature protection of compressor
☆
X O X
O(light) X(off) ☆ (flash at 5Hz) ◎ (flash at 0.5Hz)
For Duct type(12K)
NO. Malfunction
Running
lamp
Timer
lamp
Defrosting
lamp
Alarm
lamp
Display(nixie
tube)
1
Open or short circuit of T1 temperature
sensor
☆ X X X E0
2
Open or short circuit of T2 temperature
sensor
X X ☆ X E1
3
Communication malfunction between indoor
and outdoor units.
X ☆ X X E2
4 Full-water malfunction X X X ☆ E3
5 Indoor EEPROM malfunction
☆ ☆
X X E4
6 IPM module protection ☆ X X O E5
7
Open or short circuit of T3 or T4 temperature
sensor
☆
O X X E6
8 Outdoor unit voltage protection
☆
O X O P0
9 Compressor temperature protection ☆ X O X P1
10 Outdoor unit over-current protection
☆ ☆
X
☆
P2
O(light) X(off) ☆ (flash at 5Hz)