28
Installation and Maintenance
12
Refrigerant lacking
protection, refrigerant
circulation cut-o
protection
F0
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Refrigerant leaks?
2. Big valve and small valve of outdoor unit are completely
open?
3. Capillary is blocked or electronic expansion valve is
stuck?
4. Indoor evaporator temperature sensor is fallen o?
5. Outdoor condenser temperature sensor is fallen o?
6. System cooling is in high-humidity environment, which
leads to small heat exchange temperature dierence?
13
Compressor
overload protection
(Only for models with
overload)
H3
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1.Refrigerant leaks?
2.. Capillary is blocked or electronic expansion valve is
abnormal?
3. Indoor evaporator temperature sensor is fallen o?
4. Outdoor condenser temperature sensor is fallen o?
5. System cooling is in high-humidity environment, which
leads to small heat exchange temperature dierence?
14
IPM protection
(Including overheat
demagnetization)
H6
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Control board and compressor are reliably connected?
2. Compressor coil resistance is normal? Insulation of
compressor coil to copper pipe is good?
3. Outdoor fan is abnormal?
4. Big or small valve is not open, system is stuck,
condenser is blocked with dirt or ventilation is poor?
6. Mainboard power module is damaged and power
module is tightened?
7. Indoor or outdoor ambient temperature is too high?
8. Compressor is stuck?
15
Motor blockage
protection
H7
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Control board and compressor are reliably connected?
Is it loose? Connection sequence is correct?
2. Compressor coil resistance is normal? Insulation of
compressor coil to copper pipe is good?
3. Outdoor fan is abnormal?
4. Big or small valve is not open, system is stuck,
condenser is blocked with dirt or ventilation is poor?
5. Unit voltage input is in normal range (voltage between L
and N)?
6. Mainboard power module is damaged?
7. Indoor or outdoor ambient temperature is too high?
8. Compressor is stuck?
16 PFC protection HC
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
PFC current bias voltage is wrong and replace outdoor
control board?
1. Check if ODU mainboard is damaged?
2. If the grid voltage is instable and there is distortion?
17
Communication
malfunction between
IDU and detection
board
JF
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Poor connection between the indoor unit and the
inspection board.
2.The main board of indoor unit is damaged;
18
Outdoor fan
malfunction
L3
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Blade of outdoor fan is stuck by a foreign object or
touches the panel?
2. Outdoor fan terminal connection is reliable?
3. Mainboard is damaged?
4. Ambient wind power is too big?
19 Startup failure Lc
Cooling: compressor and outdoor fan stop,
while indoor fan operates
Heating: compressor, outdoor fan and
indoor fan stop
1. Control board and compressor are reliably connected?
Is it loose? Connection sequence is correct?
2. Compressor coil resistance is normal? Insulation of
compressor coil to copper pipe is good?
3. Outdoor fan is abnormal?
4. Big or small valve is not open, system is stuck,
condenser is blocked with dirt or ventilation is poor?
5. Unit voltage input is in normal range (voltage between L
and N)?
6. Mainboard power module is damaged?
7. Indoor or outdoor ambient temperature is too high?
8. Compressor is stuck?
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