27
Installation and Maintenance
9.1 Error Code List
9. Maintenance
No. Malfunction name
Display
method
of
indoor
unit
A/C status Possible causes
1
Condenser freeze
protection
E2
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Air return of indoor unit is poor?
2. Rotation speed of indoor unit is abnormal?
3. Evaporator is blocked with dirt or lter is dirty?
4. Indoor pipe temperature sensor is abnormal?
5. Capillary is blocked or electronic expansion valve is
abnormal?
6. System refrigerant leaks?
7. Ambient temperature of cooling operation is too low?
2
High discharge
temperature
protection of
compressor
E4
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Discharge temperature sensor is damaged?
2. Refrigerant leaks?
3. Capillary is blocked or electronic expansion valve is
abnormal?
4. Heat exchanger is blocked with dirt, lter is blocked with
dirt and unit ventilation is poor?
5. Outdoor fan is faulty?
6. Outdoor ambient temperature is too high?
3
Overcurrent
protection
E5
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Power supply voltage is unstable with big fluctuation?
2. Power supply voltage is too low and load is too big?
3. System load is too big, heat exchanger is blocked with
dirt, lter is blocked with dirt, unit ventilation is poor and
ambient temperature is too high?
4
IDU and ODU
communication
malfunction
E6
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. IDU and ODU connection wire and connection wires
inside the indoor unit and outdoor unit are connected
normal or whether they are damaged?
2. IDU mainboard or ODU mainboard is broken and ODU
power indicator is not on?
5
High temperature
protection
E8
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Indoor or outdoor ambient temperature is too high?
2. Indoor or outdoor fan operates abnormally?
3. Filter or condenser is blocked with dirt?
4. Indoor or outdoor pipe temperature sensor is normal?
6
EEPROM
malfunction
EE
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Power supply shakes when energize the unit for the
rst time, and re-energize the unit after 5min of de-
energization?
2. ODU reads EEPROM data wrongly and replace outdoor
control board?
7
Malfunction of indoor
ambient temperature
sensor
F1
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Terminal of indoor ambient temperature sensor is
loose?
2. Indoor ambient temperature sensor is damaged?
3. IDU mainboard is damaged?
8
Malfunction of
indoor evaporator
temperature sensor
F2
1. Terminal of indoor evaporator temperature sensor is
loose?
2. Indoor evaporator temperature sensor is damaged?
3. IDU mainboard is damaged?
9
Malfunction of
outdoor ambient
temperature sensor
F3
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Outdoor ambient temperature sensor is loose?
2. Outdoor ambient temperature sensor is damaged?
3. ODU mainboard is damaged?
10
Malfunction of
outdoor evaporator
temperature sensor
F4
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Outdoor pipe temperature sensor is loose?
2. Outdoor pipe temperature sensor is damaged?
3. ODU mainboard is damaged?
11
Malfunction of
outdoor discharge
temperature sensor
F5
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Outdoor discharge temperature sensor is not inserted
into the copper pipe?
2. Resistance of outdoor discharge temperature sensor is
normal?
3. Indoor or outdoor pipe temperature sensor is not
inserted well?
4. 4-way valve coil is not energized?
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