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111 PB
TROUBLESHOOTING
Diagnostic Codes
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
Power
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
9 Limit/
decrease
frequency
due to high
temperature
EU OFF 3s
and blink
6 times
OFF 3s
and blink
6 times
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
the radiator is inserted tightly.
If its no use, please replace
control panel AP1.
10 Malfunction
protection of
jumper cap
C5 OFF 3s
and blink
15 times
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
F0 OFF 3s
and blink
once
OFF 3s
and blink
once
OFF 1s
and blink
17 times
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
12 Indoor ambi‑
ent tempera‑
ture sensor is
open/ short
circuited
F2 OFF 3s
and blink
once
During cooling and drying
operation, indoor unit oper‑
ates 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.
13 indoor
evaporator
temperature
sensor is
open/ short
circuted
F2 OFF 3s
and blink
twice
AC stops operation once
reaches the setting tempera‑
ture. 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.
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