Service Manual
42
Installation and Maintenance
8
High discharge
temperature
protection of
compressor
E4
During cooling and drying
operation, compressor and
ODU fan motor stop while
IDU fan motor operates.
During heating operation,
all loads stop.
1. The system is abnormal. (e.g.:
blockage, etc)
Refer to Malfunction
Detection Flowchart
2. Abnormal rotation speed of outdoor
motor (cooling );
3. Abnormal outdoor air intake (cooling);
4. System is normal, but the compressor
discharge temperature sensor is broken
or poorly contacted (Please check it
by referring to the resistance table for
temperature sensor).
9
Overcurrent
protection
E5
During cooling and drying
operation, compressor and
ODU fan motor stop while
IDU fan motor operates.
During heating operation,
all loads stop.
1. Unstable supply voltage. Normal
uctuation shall be within 10% of the
rated voltage on the nameplate;
Refer to Malfunction
Detection Flowchart
2. Supply voltage is too low and load is
too high;
3. Measure the current of live wire on
mainboard. If the current isn’t higher than
the overcurrent protection value, please
check the mainboard;
4. The indoor and outdoor heat
exchangers are too dirty, or the air inlet
and air outlet are blocked;
5. The fan speed of fan motor is too low
or the fan motor 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 (lth
blockage, ice blockage, greasy blockage
or valve hasn’t been opened completely
)
.
10
Communication
malfunction
E6
During cooling and drying
operation, compressor
and outdoor fan stop while
indoor fan operates. During
heating operation, all loads
stop.
See 9.2 (Communication malfunction)
Refer to maintenance
owchart
11
Overload
malfunction
E8 The entire unit stops.
1. Indoor and outdoor heat exchanger is
too dirty?
Or air inlet/outlet is blocked?
2. Fan motor is not working. Abnormal
fan speed; fan speed is too low or the fan
doesnt run.
3. Compressor operates normally or not?
Is there any abnormal noise or oil leak?
Casing is too hot?
4. System is blocked inside? (Dirt
blockage? Ice blockage?
Oil blockage? Y-valve is not fully open?)
5. Main board temperature sensor detects
wrongly.
Refer to Malfunction
Detection Flowchart
12
In defect of
refrigerant
F0
The Dual-8 Code Display
will show
F0 and the complete unit
stops.
1. In defect of refrigerant;
2. Indoor evaporator temperature sensor
works abnormally;
3. The unit has been plugged up
somewhere.
Refer to Malfunction
Detection Flowchart
To Next Page
Loading...
