Midea mcd-24hrdn1 - Page 207

Troubleshooting
Electrical Control System 197
2.2 Indoor unit malfunction
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 ☆ ☆ ☆ ☆
11 Inverter compressor drive protection ☆ ◎ X X
12 Discharge 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