13
Installation and Maintenance
Service Manual
9.1 Error Code List
9. Maintenance
No. Malfunction Name
Display Method
of Indoor Unit
A/C status
Possible Causes
Dual-8 Code
Display
1
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.
2
Low pressure
protection of system
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
3
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).
4
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.
5
Communication
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.
6
High temperature
resistant protection
E8
During cooling operation: compressor will
stop while indoor fan will operate. During
heating operation, the complete unit stops.
R e fe r to th e ma l fu n cti o n a n a l ysi s
(overload, high temperature resistant).
7
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
8
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 it's no use, please replace control panel
AP1.
9
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.
10 Gathering refrigerant
Fo
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
11
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.
