Troubleshooting - Midea MOU-12HN1 User Manual

Troubleshooting

10. Troubleshooting
10.1. Self-diagnosis
Indoor unit's LED indication
(1) For the Four-way cassette
During malfunction protection, digital pipe displays as follow:
No Displaying contents
1
2
3
4
5
6
7
(2) For the other types indoor unit
No. Type Contents
1 Normal Standing-by
2 Normal System Off
3 Normal System startup
4 Normal Forced cooling
Over current protection of the compressor
5 Protection
occurs 4 times in 1h
Outdoor protection (lack of phase, phase
6 Protection
sequence and temperature protection)
Room temperature sensor checking
7 Error
channel is abnormal
Evaporator sensor checking channel is
8 Error
abnormal
Condenser sensor checking channel is
9 Error
abnormal
10 Error Communication of EEPROM malfunction
Water level alarm/pump sensor
11 Error
malfunction
(3) LEDs' for the indication of outdoor trouble (3 phase type, 14, 16kW)
Type Contents
Trouble Phase sequence
Trouble Lack of phase(A,B)
Trouble Lack of phase(C)
Trouble Protection of Low pressure
Trouble Overload of current
Trouble Communication malfunction
Trouble Open-circuit and short-circuit trouble of T3
Open-circuit and short-circuit trouble of
Trouble
T4(High discharge temperature protection)
Trouble High temperature protection of condenser
118
Malfunction or protection
Indoor temperature sensor is abnormal
E2
E3 Evaporator temperature sensor is abnormal
Condenser temperature sensor is abnormal
E4
Temperature sensor error of water pump
E5
Outdoor unit malfunction
E6
EEPROM malfunction
E7
Full-water malfunction
E8
LED Flashing
Operation lamp flashes at 0.5Hz
All lamps are off
Operation lamp on
Operation lamp flashes at 5Hz,
Timer lamp on
Lamps of operation, timer,
defrosting (only fan) flashing
simultaneously at 5Hz.
All lamps flashing at 5Hz
Timer lamp flashing at 5Hz
Operation lamp flashing at 5Hz
Defrosting lamp flashing at 5Hz
Operation lamp and timer lamp
flashing at 5Hz
Alarm lamp flashes at 5Hz
LED1
Flash
Flash
Off
Flash
Off
Flash
Off
Off
Flash
MCAC-UTSM-2008-11
Remark
Nothing wrong with the
unit when LED indicate
these contents.
Whole unit is shut
down. It cannot recover
unless power is cut off
Recover automatically
after errors are
eliminated (For T3
malfunction of 5HP,
can't recover
automatically)
LED2 LED3
Off Off
Off Off
Off Off
Flash Off
Off Flash
Off Flash
Flash Flash
Flash Off
Flash Flash
Outdoor Units