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898841-UIM-B-0113
Johnson Controls Unitary Products 37
TABLE 13:
Error Codes - 18K 24K
No.
Malfunction
Name
Display Method of Indoor Unit
Display Method of Outdoor
Unit (Indicator has 3 kinds of
display status and they will
be repeated every 5s.)
A/C status Possible Reasons
Dual-8
Code
Display
Indicator Display (during
blinking,
ON 0.5s and OFF 0.5s)
□ OFF
■ Illuminated
☆ Blink
Operation
Indicator
Cool
Indicator
Heating
Indicator
D5
(D40)
D6
(D41)
D16
(D42)
D30
(D43)
1
High pressure
protection
of system
E1
OFF 3s and
blink once
□☆☆☆
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 overcharged;
2. Poor heat exchange (including
filth blockage of heat exchanger
and bad radiating environment);
Ambient temperature is too high.
2
Antifreezing
protection
E2
OFF 3S
and blink
twice
■□■□
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
High discharge
temperature
protection of
compressor
E4
OFF 3S
and blink
4 times
■□■☆
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all loads stop.
Please refer to the ProficienTECH
Ductless Splits Technical Training
Manual (discharge protection,
overload).
4
Overcurrent
protection
E5
OFF 3S
and blink
5 times
□■☆□
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 an
load is too high;
3. Evaporator is dirty.
5
Communication
Malfunction
E6
OFF 3S
and blink 6
times
□□□☆
During cooling operation,
compressor stops while
indoor fan motor operates.
During heating operation,
the complete unit stops.
Refer to the corresponding
ProficienTECH Ductless Splits
Technical Training Manual.
6
High
temperature
resistant
protection
E8
OFF 3S
and blink
8 times
■□■■
During cooling operation:
compressor will stop while
indoor fan will operate.
During heating operation,
the complete unit stops.
Refer to the ProficienTECH Duct-
less Splits Technical Training Man-
ual
(overload, high temperature
resistant).
7
Circuit PG
motor (indoor
fan) has circuit
malfunction
by zero cross
detection
U8
OFF 3S
and blink
for 17 times
Operation of remote
controller or control panel is
available, but the unit wont
act.
Control board is damaged.
8
PG motor
(indoor fan
motor) does
not operate
H6
OFF 3S
and blink
11 times
The complete unit will stop
operation.
Poor connection for PGF in circuit
diagram;
Malfunction of indoor units control
panel AP1;
Malfunction of indoor units motor
M1.
9
Malfunction
protection of
jumper cap
C5
OFF 3S
and blink
15 times
The complete unit will stop
operation.
Poor connection for the jumper cap
on indoor units control panel AP1;
please reinsert or replace the
jumper cap;
10
Indoor ambient
temperature
sensor is open/
short circuited
F1
OFF 3S
and blink
once
During cooling and drying
operation, indoor unit
operates while other loads
will stop; during heating
operation, the complete
unit will stop operation.
1.Room temperature sensor hasn’t
been connected well with indoor
units control panel AP1 (refer to
the wiring diagram for indoor unit);
2.Room temperature sensor is
damaged (please refer to the resis-
tance table of temperature sensor)
11
Indoor evapora-
tor temperature
sensor is open/
short circuited
F2
OFF 3S
and blink
twice
During cooling and drying
operation, indoor unit will
operate while other loads
will stop; During heating
operation, the complete
unit will stop operation.
1.Room temperature sensor hasn’t
been connected well with indoor
units control panel AP1 (refer to
the wiring diagram for indoor unit);
2.Room temperature sensor is
damaged (please refer to the resis-
tance table of temperature sensor)
12
Outdoor
ambient
temperature
sensor is open/
short circuited
F3
OFF 3S
and blink
3 times
□□☆■
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation,
the complete unit will stop
operation.
Outdoor temperature sensor
hasn’t been connected well or is
damaged. Please check it by
referring to the resistance table
for temperature sensor).