UNIT MAINTENANCE &
SER
VICE GUIDE
P32 OF 46
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
Hearing sound of "water flow" inside unit.
Normally this is due to refrigerant flowing through coils.
Mist is blown out of unit.
Normally it happens during cooling start period, when indoor
air is hot and humid.
Hearing creaking noise during unit starting or shutting off.
Normally this is caused by the expansion or contraction at
components due to the temperature changes.
The unit doesn't operate at all.
1) Is power shut off or lost?
2) Is TIMER set up?
3) Is circuit breaker not engaged, or even trips?
4) Is fuse not connected, or even blown?
5) Is voltage too high or low?
6) Is the flow control or other switches breaking the circuit?
7) Is unit under 3-minute restarting protection period?
8) Is the remote control our of battery power?
Phenomenon
Normal or Abnormal
Unit doesn't respond to remote control.
1) Is the remote control our of battery power?
2) Is remote control pointing to sunshine or lighting?
3) Is remote control signal blocked?
4) Is remote control too far away from indoor unit?
5) Is the fuse on indoor unit blown?
6) Is the indoor unit powered on?
7) Is the indoor unit transformer good?
8) Is the indoor unit control board good?
Cooling (heating) is not powerful.
1) Is the set temperature too high or too low?
2) Is filter dirty?
3) Is air vent blocked?
4) Is unit undersized?
5) Is window or door closed?
6) Is unit refrigerant at lower level?
7) Is outdoor too hot or cold?
8) Is fan speed set at low?
CHECKING UNITS PRIOR TO CONTACTING YOUR TECHNICIAN
UNIT MAINTENANCE &
SER
VICE GUIDE
P31 OF 46
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
Do not repair the air conditioner at your discretion. Incorrect repair may cause electric shock or fire, so please
contact authorized service center for professional repair.
Following checks prior to contact may save your time and costs.
Phenomenon
Normal or Abnormal
The unit doesn't deliver cooling or heating, immediately after the
unit is restarted (remote control or power resuming).
If unit is powered off, and then restored, it will not run the
compressor until 3 minutes later. This is normal 3-minutes
restarting protection against high internal refrigerant pressure.
The unit emits a smell.
For new unit, some of the smell is normal.
For any bad or abnormal smell, need to shut off the unit and
check around. May need to call your technician.
CHECKING UNITS PRIOR TO CONTACTING YOUR TECHNICIAN
System abnormal (anti-high temp, power off, cooling overload)
Compressor overload protection
H3
Blink 3 times
Module protection
High-pressure protection
Anti-freeze protection power-off
Discharge temperature protection
Low voltage over-current protection
Mode clash
Communication malfunction
Indoor ambient temp sensor open, short circuit
Defrost or heating oil return
Protection and Error Code Names
Dual-8 Display Running Lamp Heating Lamp Cooling Lamp
H4
H5
E1
E2
Blink 4 times
Blink 5 times
Blink once
Blink twice
E4
E5
E7
E6
H1
Blink 4 times
Blink 5 times
Blink 7 times
Blink 6 times
Blink once
F1
F2
F3
F4
F5
H7
HC
HE
Blink once
Blink twice
Blink 3 times
Blink 4 times
Blink 5 times
Blink 7 times
Blink 6 times
Blink 14 times
F6
F8
Blink 6 times
Blink 8 times
PROTECTION AND ERROR CODES
Indoor unit temp sensor open, short circuit
Outdoor ambient temp sensor open, short circuit
Outdoor unit temp sensor open
Outdoor unit discharge temp sensor open
Fail to start up
PFC malfunction
Compressor demagnification protection
Cooling overload down frequency
Unit overflow down frequency
F9
E0
H0
E9
F7
Blink 9 times
Blink 10 times
Blink 10 times
Blink 9 times
Blink 7 times
Compressor discharge down frequency
Unit AC voltage decreasing down frequency
Heat anti high temp down frequency
Anti cool air protection
Cooling oil return
