49
Installation and Maintenance
Service Manual
Error
code
Malfunction name AC status Possible causes
Outdoor condenser
temperature sensor is
open/short-circuited
Cool/Dry: compressor and outdoor
fan stop operation, while indoor fan
operates;
Heat: after operating for 3mins, all
loads stops operation.
1. Temperature sensor is not connected well or damaged;
2. Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or outer
case;
3. Main board of outdoor unit is damaged.
Outdoor air discharge
temperature is open/short-
circuited
Complete unit stops operation;
motor of sliding door is cut off
power.
1. The exhaust temperature sensor is not connected well or
damaged.
2.Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or outer
case
3.Main board of outdoor unit is damaged;
Malfunction of micro switch Cool/Dry: compressor stops
operation, while indoor fan
operates;
Heat: all loads stops operation.
1. The sliding door is blocked;
2. Malfunction of the photoelectric inspection panel of sliding
door;
System is abnormal Cool/Dry: all loads stops operation
except indoor fan;
Heat: all loads stops operation.
See “High temperature prevention protection; high power;
system isabnormal”
Desynchronizing of
compressor
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
See “Desynchronization diagnosis for compressor”
PFC protection Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
1. The power grid quality is bad; AC input voltage uctuates
sharply;
2. Power plug of air conditioner or wiring board or reactor is not
connected reliably;
3. Indoor and outdoor heat exchanger is too dirty, or air inlet/
outlet is blocked;
4. Main board of outdoor unit is damaged.
Demagnetization
protection of compressor
Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
rst; about 1min later, indoor fan
stops operation.
1. The main board of outdoor unit is damaged;
2. Compressor is damaged;
Communication
malfunction between
indoor unit and inspection
board
Normal operation 1. Poor connection between the indoor unit and the inspection
board.
2.The main board of indoor unit is damaged;
3. The inspection board is damaged;
Malfunction of humidity
sensor
Compressor, outdoor fan and
indoor fan stop operation;
The inspection board is damaged.
High power protection Cool: compressor and outdoor fan
stops operation, while indoor fan
operates.
See “High temperature prevention protection; high power;
system is abnormal”
Start-up failed Cool/Dry: compressor stops, while
indoor fan operates; Heat: all loads
stops operation.
See “Malfunction diagnosis for failure startup”
Lost phase Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
rst; about 1min later, indoor fan
stops operation.
1. The main board of outdoor unit is damaged;
2. The compressor is damaged;
3. The connection wire of compressor is not connected well.
Over-phase current
protection of compressor
Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
See “Overload protection of compressor , High discharge
temperature protection of compressor”
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