31
Installation and Maintenance
Service Manual
7
Lack of
refrigerant
or block
protection for
the system(not
applicable to
residential air
conditioner)
or Overload
protection
compressor
F0
The Dual-8 Code Display will show F0
and the complete unit stops.
1.Refrigerant leakage;
2.Indoor evaporator temperature sensor works
abnormally;
3.The unit has been plugged up somewhere;
4.The compressor can’t be started up normally. Because
the power voltage for the complete unit is too low, and the
outdoor working condition is too high.
8
Overload
protection for
compressor
H3
The entire unit stops.
1. Outdoor and indoor heat exchangers are too dirty or
the air inlet/outlet is blocked.
2. Fan motor is not working Abnormal fan speed; fan
speed is too low or the fan doesn't run.
3. Compressor doesn't work normally.Strange noise or
leakage occurs.Temperature of the shell is too high.
4. System is blocked inside(dirt block, ice block, oil block,
Y-valve not fully open).
5. High pressure switch is abnormal.
6. The refrigerant is leaking and cause overheating
protection to compressor.
9
High pressure
protection
E1
During cooling and drying operation,
except indoor fan operates, all loads
stop operation. During heating
operation, if it is inverter unit, the
complete unit stops; if it is floorstanding
unit, the complete unit stops and
operation of remote controller or
controller is unavailable.
1. The main board and the display panel are not
connected well.
2. The HPP terminal on main board is not connected well
with the high pressure switch on the complete unit.
3. The wiring of high pressure switch is loosened.
4. Refrigerant is superabundant;
5. Poor heat exchange (including blocked heat exchanger
and bad radiating environment );
6. Ambient temperature is too high; (if it is 3-phase
unit, the high pressure protection may be caused by
overcurrent protection due to this reason)
7. The supply voltage is abnormal (if it is 3-phase unit, the
high pressure protection may be caused by overcurrent
protection due to this reason)
8. The air intake and air discharge at indoor / outdoor
heat exchanger are not smooth. The air cycle is short
circuited.
9. Filter and heat exchange fins of indoor/outdoor units
areblocked.
10. The system pipeline is blocked. 1
11. The gas valve and liquid valve for outdoor unit are not
completely opened.
12. The HPP input is at high level.
10
Overcurrent
protection(
This
protection
function is not
available for
those models
whose cool
-
ing capacity
≤12000Btu/h
)
E5
During cooling and drying operation,
except IDU fan motor operates, other
loads stop operation; During heating
operation, the system stops operation.
1.Unstable supply voltage. Normal fl uctuation shall be
within 10% of the rated voltage on the nameplate.
2.Supply voltage is too low and load is too high.
3.Measure the current of live wire on main board. If the
current isn’t higher than the overcurrent protection value,
please check the controller.
4.The indoor and outdoor heat exchangers are too dirty,
or the air inlet and air outlet are blocked.
5.The fan motor is not running. Abnormal fan speed: fan
speed is too low or the fan doesn’t run
6.The compressor is not running normally. There is
abnormal sound, oil leakage or the temperature of the
shell is too high, etc.
7.There’s blockage in the system (filth blockage, ice plug,
greasy blockage, Y-valve hasn’t been opened completely)
