Midea MCA-12HRN1, User Manual

Page: 120 / 141

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