898841-UIM-B-0113
38
Johnson Controls Unitary Products
13
Outdoor
condenser
temperature
sensor is open/
short circuited
F4
OFF 3S
and blink
4 times
□
□
☆
□
During cooling and drying
operation, compressor stops
while indoor fan will
operate; 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).
14
Outdoor
discharge
temperature
sensor is open/
short circuited
F5
OFF 3S
and blink
5 times
□
□
☆
☆
During cooling and drying
operation, compressor will
stop after operating for about
3 mins, while indoor fan will
operate; During heating
operation, the complete unit
will stop after operating for
about 3 mins.
1.Outdoor temperature sensor
hasn’t been connected well or is
damaged. Please check it by
referring to the resistance table for
temperature sensor).
2.The head of temperature sensor
hasn’t been inserted into the
copper tube.
15
Limit/ decrease
frequency
due to overload
F6
OFF 3S
and blink
for 6
times
■
□
☆
☆
All loads operate normally,
while operation frequency for
compressor is decreased.
Refer to the ProficienTECH Duct-
less Splits Technical Training Man-
ual (overload, high temperature
resistant).
16
Decrease
frequency due
to overcurrent
F8
OFF 3S
and blink
8 times
■
■
□
■
All loads operate normally,
while operation frequency for
compressor is decreased.
The input supply voltage is too low;
System pressure is too high and
overload.
17
Decrease
frequency due
to high air
discharge
F9
OFF 3S
and blink
9 times
■
■
□
□
All loads operate normally,
while operation frequency for
compressor is decreased.
Overload or temperature is too
high; Refrigerant is insufficient;
Malfunction of electric expansion
valve (EKV).
18
Voltage for
DC bus-bar
is too high
PH
OFF 3S
and blink
11 times
□
■
□
☆
During cooling and drying
operation, compressor will
stop while indoor fan will
operate; During heating
operation, the complete
unit will stop operation.
1. Measure the voltage of position
L and N on wiring board (XT), if the
voltage is higher than 265VAC,
turn on the unit after the supply
voltage is increased to the normal
range.
2. If the AC input is normal
measure the voltage of electrolytic
capacitor C on control panel (AP1),
if its normal, there’s malfunction for
the circuit, please replace the con-
trol panel (AP1).
19
Malfunction of
complete units
current
detection
U5
OFF 3S
and blink
13 times
□
■
☆
■
During cooling and drying
operation, the compressor
will stop while indoor fan
will operate; During heating
operating, the complete
unit will stop operation.
There’s circuit malfunctionon out-
door units control panel AP1,
please replace the outdoor units
control panel AP1.
20
Overcurrent
protection of
phase current
for compressor
P5
OFF 3S
and blink
15 times
□
☆
□
□
During cooling and drying
operation, compressor will
stop while indoor fan will
operate; During heating
operation, the complete
unit will stop operation.
Refer to the ProficienTECH Duct-
less Splits Technical Training Man-
ual (IPM protection, loss of
synchronism protection and
overcurrent protection of phase
current for compressor.
21
Defrosting
H1
OFF 3S
and blink
once
Defrosting will occur in
heating mode. Compressor
will operate while indoor fan
will stop operation.
Its the normal state.
22
Static
de-dusting
protection
H2
OFF 3S
and blink
twice
/
/
23
Overload
protection for
compressor
H3
OFF 3S
and blink
3 times
□
☆
☆
□
During cooling and drying
operation, compressor will
stop while indoor fan will
operate; During heating
operation, the complete
unit will stop operation.
1. Wiring terminal OVC-COMP is
loosened. In normal state, the
resistance for this terminal should
be less than 1ohm.
2.Refer to the ProficienTECH
Ductless Splits Technical Training
Manual (discharge protection,
overload).
TABLE 13:
Error Codes - 18K 24K (Continued)
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)
