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9. Maintenance
Service Manual
9.1 Error Code List
Error
Malfunction name
code
Malfunction of jumper cap
Communication
malfunction between
indoor unit and outdoor
unit
IPM protection
Malfunction of outdoor fan/
malfunction of DC motor
Overload protection of
compressor
Refrigerant insufficient
protection, cut-off
protection of refrigerant
Indoor ambient
temperature sensor is
open/short-circuited
Indoor evaporator
temperature sensor is
open/short-circuited
No feedback from indoor
unit's motor
Indoor unit and outdoor
can be matched with each
other
Malfunction of jumper cap
of outdoor unit
Gas valve temperature
sensor is ON / short-
circuited
Installation and Maintenance
AC status
The complete unit stops operation 1. Jumper cap is not installed in control panel;
Cool: compressor stops operation,
while indoor fan operates;
Heat: all loads stops operation.
Cool/Dry: compressor stops
operation, while indoor fan
operates.
Heat: all loads stops operation.
Cool/Dry: all loads stops operation
except indoor fan.
Heat: all loads stops operation.
Cool/Dry: compressor stops
operation, while indoor fan
operates.
Heat: all loads stops operation.
Cool: compressor and outdoor fan
stops operation, while indoor fan
operates;
Heat: Compressor, outdoor fan
and indoor fan stops operation.
Cool/Dry: indoor fan operates,
while compressor and outdoor fan
stops operation;
Heat: all loads stops operation.
Cool/Dry: indoor fan operates,
while compressor and outdoor fan
stops operation;
Heat: all loads stops operation.
The complete unit stops operation 1. Is the fan blocked?
Heat: compressor, outdoor unit
and indoor fan stops operation.
Heat: all loads are stopped;
other modes: outdoor unit stops
operation.
Possible causes
2. Poor contact of jumper cap;
3. Jumper cap is damaged;
4. The tested circuit of jumper cap on control panel is abnormal.
See "Communication malfunction"
See "IPM protection, over-phase current of compressor"
1. Outdoor condenser, air inlet and air outlet are blocked by filth
or dirt;
2. Fan is blocked or loosened;
3. Motor or connection wire of motor is damaged;
4. Main board of outdoor unit is damaged;
(As for dual-outdoor fan, L3 indicates fan 1; LA indicates fan 2)
1. Overload wire of compressor is loose;
2. The overload protector is damaged. Under normal
circumstances, the resistance between both ends of terminal is
less than 1ohm.
3.See "Overload protection of compressor , High discharge
temperature protection of compressor"
1. Is system cooling under high humidity environment, thus
temperature difference of heat transfer is small;
2. Check whether the big valve and small valve of outdoor unit
are opened completely;
3. Is the temperature sensor of evaporator of indoor unit loose?
4. Is the temperature sensor of condenser of outdoor unit loose?
5. Is the capillary or the electronic expansion valve blocked?
6. Is refrigerant leaking?
1. Temperature sensor is not well connected;
2. Temperature sensor is damaged 3. Main board of indoor unit
is damaged.
1. Temperature sensor is not well connected;
2. Temperature sensor is damaged
3. Main board of indoor unit is damaged.
2. Is the motor terminal loose?
3. Is the connection wire of motor damaged?
4. Is the motor damaged?
5. Is the main board of indoor unit damaged?
Capacity of indoor unit and outdoor unit can't be matched.
Jumper cap of outdoor unit hasn't been installed.
1. Temperature sensor is not well connected or damaged;
2. The wire of temperature sensor is damaged, causing short
circuit to copper pipe or outer casing;
3. Main board of outdoor unit is damaged.
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Troubleshooting
