Carrier 538FEQ009RBGA, Service Manual

Page: 19 / 94

19
No.
Malfunction
Name
Display Method of Indoor Unit Display Method of Outdoor Unit
A/C Status Possible Causes
Dual-8
Code
Display
Indicator Display (during blinking,
ON 0.5s and OFF 0.5s)
Indicator has 3 kinds of display
status and during blinking, ON 0.5s
and OFF 0.5s
Operation
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
1
High pressure
protection of
system
E1
During cooling and drying
operation, indoor fan operates,
all modes stop operation.
During heating operation, the
unit stops.
Possible reasons:
1. Refrigerant was overcharged ;
2. Poor heat exchange (including
blockage of heat exchanger
3. Ambient temperature is too high
2
Anti-freezing
protection
E2
OFF 1S
and blink3
times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates.
1. Poor air-return in indoor unit;
2. Fan speed is abnormal;
3. Evaporator is dirty.
3
Refrigerant
leakage
protection
F0
OFF 1S
and blink
9 times
The Code Display displays F0
and the complete unit stops.
1. Refrigerant leakage;
2. Indoor evaporator temperature
sensor not working;
3. The unit has a restriction in the
piping.
4
High discharge
temperature
protection of
compressor
E4
OFF 1S
and blink
7 times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all modes stop.
Refer to the malfunction analysis
(discharge protection, overload).
5
Overcurrent
protection
E5
OFF 1S
and blink
5 times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all modes stop.
1. Supply voltage is unstable;
2. Supply voltage is too low and
load is too high;
3. Evaporator is dirty.
6
Communication
Malfunction
E6 Always
During cooling operation,
compressor stops while indoor
fan motor operates. During
heating operation, the
complete unit stops.
Refer to the corresponding
malfunction analysis.
7
High
temperature
resistant
protection
E8
OFF 1S
and blink
6 times
During cooling operation:
compressor stops while indoor
fan operates. During heating
operation, the complete unit
stops.
Refer to the malfunction analysis
(overload, high temperature
resistant).
8
EEPROM
malfunction
EE
OFF 1S
and blink
11 times
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
complete unit stops
Replace outdoor control panel AP1
9
Limit / decrease
frequency due to
high temp. of
module
EU
All modes operate normally,
while operation frequency for
compressor is decreased
Discharging after the complete unit
is de-energized for 20mins, ensure
the thermal grease on IPM Module
of the outdoor control panel AP1 is
sufficient. If is no use, replace the
control panel AP1.
10
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.
11
Gathering
refrigerant
Fo
OFF 1S
and
blink17
times
When the outdoor unit
receives signal of gathering
refrigerant, the system is
forced to run under cooling
mode for gathering refrigerant
Nominal cooling mode
12
Indoor ambient
temperature
sensor is
open/short
circuited
F1
During cooling and drying
operation, indoor unit operates
while other modes stop; during
heating operation, the
complete unit stops operation.
1. Loosening or bad contact of
indoor ambient temp. sensor and
mainboard terminal.
2. Indoor ambient temp. sensor
damaged.(check with sensor
resistance value chart)
3. Mainboard damaged.
13
Indoor
evaporator
temperature
sensor is
open/short
circuited
F2
AC stops operation once
reaching the setting
temperature. Cooling, drying:
internal fan motor stops
operation while other modes
stop operation; heating: AC
stop operation
1. Loosening or bad contact of
Indoor evaporator temp. sensor
and mainboard terminal.
2. Components on the mainboard
fail and lead to a short circuit..
3. Indoor evaporator temp. sensor
damaged.(check temp. sensor
value chart for testing)
4. Mainboard damaged.
14
Outdoor ambient
temperature
sensor is
open/short
circuited
F3
OFF 1S
and blink
6 times
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation,the
complete unit stops operation Outdoor temperature sensor has
not been connected well or is
damaged. Check it by referring to
the resistance table for
temperature sensor)
15
Outdoor
condenser
temperature
sensor is
open/short
circuited
F4
OFF 1S
and blink
5 times
During cooling and drying
operation, compressor stops
while indoor fan operates;
During heating operation, the
unit stops operation. Outdoor temperature sensor has
not been connected well or is
damaged. check it by referring to
the resistance table for
temperature sensor)