47
Installation and Maintenance
Service Manual
9.1 Error Code List
9. Maintenance
Error
code
Malfunction name AC status Possible causes
Malfunction of jumper cap The complete unit stops operation 1. Jumper cap is not installed in control panel;
2. Poor contact of jumper cap;
3. Jumper cap is damaged;
4. The tested circuit of jumper cap on control panel is abnormal.
Communication
malfunction between
indoor unit and outdoor
unit
Cool: compressor stops operation,
while indoor fan operates;
Heat: all loads stops operation.
See “Communication malfunction”
IPM protection Cool/Dry: compressor stops
operation, while indoor fan
operates.
Heat: all loads stops operation.
See “IPM protection, over-phase current of compressor”
Malfunction of outdoor fan/
malfunction of DC motor
Cool/Dry: all loads stops operation
except indoor fan.
Heat: all loads stops operation.
1. Outdoor condenser, air inlet and air outlet are blocked by lth
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)
Overload protection of
compressor
Cool/Dry: compressor stops
operation, while indoor fan
operates.
Heat: all loads stops operation.
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”
Refrigerant insufcient
protection, cut-off
protection of refrigerant
Cool: compressor and outdoor fan
stops operation, while indoor fan
operates;
Heat: Compressor, outdoor fan
and indoor fan stops operation.
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?
Indoor ambient
temperature sensor is
open/short-circuited
Cool/Dry: indoor fan operates,
while compressor and outdoor fan
stops operation;
Heat: all loads stops operation.
1. Temperature sensor is not well connected;
2. Temperature sensor is damaged 3. Main board of indoor unit
is damaged.
Indoor evaporator
temperature sensor is
open/short-circuited
Cool/Dry: indoor fan operates,
while compressor and outdoor fan
stops operation;
Heat: all loads stops operation.
1. Temperature sensor is not well connected;
2. Temperature sensor is damaged
3. Main board of indoor unit is damaged.
No feedback from indoor
unit’s motor
The complete unit stops operation 1. Is the fan blocked?
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?
Indoor unit and outdoor
can be matched with each
other
Heat: compressor, outdoor unit
and indoor fan stops operation.
Capacity of indoor unit and outdoor unit can’t be matched.
Malfunction of jumper cap
of outdoor unit
Heat: all loads are stopped;
other modes: outdoor unit stops
operation.
Jumper cap of outdoor unit hasn’t been installed.
Gas valve temperature
sensor is ON / short-
circuited
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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