42
Installation and Maintenance
Service Manual
43
Outdoor fan motor
is desynchronizing
■ □ □
☆
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Outdoor fan motor is desynchronizing.
44
Limit/decrease
frequency due
to phase current
protection
■ ■ □
☆
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Phase-current of compressor is too high.
45
Outdoor ambient
temperature is
abnormal
■
☆
□ ■
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Outdoor ambient temperature is too high or
too low.
46
Current detecting
circuit of fan motor
is faulted
■
☆
□
☆
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Current detecting circuit of fan motor is
abnormal.
47
Freon-lacking
protection,
refrigerant
circulation cut-off
protection
■
☆
■ ■
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
The air conditioner lacks of refrigerant/the
valve has not been opened/the system is
blocked.
48
Limit/decrease
frequency due to
peak current
■
☆ ☆
■
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
PFC peak current is too high.
3. Malfunction Checkup Flow
First dene the malfunction according to the indicator of IDU/ODU and list for malfunctions (always stuck on the electric box or top cover
of unit).
Once there is malfunction, the indicator of outdoor control board will directly display corresponding malfunction.
Some malfunctions can be directly displayed on the monitor of indoor unit, while some should be checked by using remote controller (press
the light button for 4 times in 3 seconds).
In the following diagnosis ow, “Y” means “Yes”, “N” means “No”.
In the following diagnosis ow, control board AP1 means control board of outdoor unit.
Notes: Before conducting malfunction maintenance, please conduct electric discharge for electrolytic capacitor according to the above
methods and make sure that the voltage has dropped to 20V or below, otherwise it may cause electric shock or damage of control board.
3.1. IPM Protection, Out-of-step Fault, Compressor Phase Overcurrent (AP1 below refers to the outdoor control
panel)
Possible D5 D6 D16 D30
IPM Protection
□ ☆ □ ■
Out-of-step Fault
□ ☆ ■ ☆
Compressor Phase Overcurrent
□ ☆ □ □
Main check points:
●Is the connection between control panel AP1 and compressor COMP secure? Loose? Is the connection in correct order?
●Is the voltage input of the machine within normal range? (Use AC voltmeter to measure the voltage between terminal L and N on the
wiring board XT)
●Is the compressor coil resistance normal? Is the insulation of compressor coil against the copper tube in good condition?
●Is the working load of the machine too high? Is the radiation good?
●Is the charge volume of refrigerant correct?
Fault diagnosis process:
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