37
Installation and Maintenance
Service Manual
9.1 Error Code List
9. Maintenance
Malfunction
Name
Display Method
of Indoor Unit
(Error Code)
A/C Status
Possible Causes(For specific maintenance
method, please refer to the following procedure of
troubleshooting)
High pressure
protection of
system
E1
During cooling and drying operation,
except indoor fan operates, all loads
stop operation.
During heating operation, the complete
unit stops.
Possible reasons:
1. Refrigerant was superabundant;
2. Poor heat exchange (including filth blockage of heat
exchanger and bad radiating environment ); Ambient
temperature is too high.
Anti-freezing
protection for
evaporator
E2
Not the error code. It’s the status code for the
operation.
System block
or refrigerant
leakage
E3
The Dual-8 Code Display will show
E3 until the low pressure switch stop
operation.
1.Low-pressure protection
2.Low-pressure protection of system
3.Low-pressure protection of compressor
High discharge
temperature
protection of
compressor
E4
During cooling and drying operation,
compressor and outdoor fan stop while
indoor fan operates. During heating
operation, all loads stop.
Please refer to the malfunction analysis (discharge
protection, overload).
Overcurrent
protection
E5
During cooling and drying operation,
compressor and outdoor fan stop while
indoor fan operates. During heating
operation, all loads stop.
1. Supply voltage is unstable;
2. Supply voltage is too low and load is too high;
3. Evaporator is dirty.
Communi-
cation
Malfunction
E6
During cooling operation, compressor
stops while indoor fan motor operates.
During heating operation, the complete
unit stops.
Refer to the corresponding malfunction analysis.
High
temperature
resistant
protection
E8
During cooling operation: compressor
will stop while indoor fan will operate.
During heating operation, the complete
unit stops.
Refer to the malfunction analysis (overload, high temperature
resistant).
EEPROM
malfunction
EE
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop
Replace outdoor control panel AP1
Limit/decrease
frequency due
to high
temperature of
module
EU
All loads operate normally, while
operation frequency for compressor is
decreased
Discharging after the complete unit is de-energized for
20mins, check whether the thermal grease on IPM Module
of outdoor control panel AP1 is sufficient and whether the
radiator is inserted tightly.
If its no use, please replace control panel AP1.
Malfunction
protection of
jumper cap
C5
Wireless remote receiver and button are
effective, but can not dispose the related
command
1. No jumper cap insert on mainboard.
2. Incorrect insert of jumper cap.
3. Jumper cap damaged.
4. Abnormal detecting circuit of mainboard.
Gathering
refrigerant
F0
When the outdoor unit receive signal of
Gathering refrigerant ,the system will
be forced to run under cooling mode for
gathering refrigerant
Nominal cooling mode
Indoor ambient
temperature
sensor is
open/short
circuited
F1
During cooling and drying operation,
indoor unit operates while other loads
will stop; during heating operation, the
complete unit will stop operation.
1. Loosening or bad contact of indoor ambient temp. sensor
and mainboard terminal.
2. Components in mainboard fell down leads short circuit.
3. Indoor ambient temp. sensor damaged.(check with sensor
resistance value chart)
4. Mainboard damaged.
Indoor
evaporator
temperature
sensor is
open/short
circuited
F2
AC stops operation once reaches the
setting temperature. Cooling, drying:
internal fan motor stops operation while
other loads stop operation; heating: AC
stop operation
1. Loosening or bad contact of Indoor evaporator temp.
sensor and mainboard terminal.
2. Components on the mainboard fall down leads short
circuit.
3. Indoor evaporator temp. sensor damaged.(check temp.
sensor value chart for testing)
4. Mainboard damaged.
