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Malfunction
No.
Dual-8
Name
Code
Display
Outdoor
condenser
temperature
16
F4
sensor is
open/short
circuited
Outdoor
discharge
temperature
17
F5
sensor is
open/short
circuited
Limit/
decrease
18
frequency
F6
due to
overload
Decrease
frequency
19
F8
due to
overcurrent
Decrease
frequency
20
due to
F9
high air
discharge
Limit/
decrease
21
frequency
FH
due to
antifreezing
28
Display Method of Indoor Unit
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Operation
Cool
Heat
Indicator
Indicator
Indicator
OFF 3S
and blink
4 times
OFF 3S
and blink
5 times
OFF 3S
and blink
for 6
times
OFF 3S
and blink
8 times
OFF 3S
and blink
9 times
OFF 3S
OFF 3S
and blink
and blink
2 times
2 times
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
Yellow
Red
Green
Indicator
Indicator
Indicator
OFF 1S
and
blink
5 times
OFF 1S
and
blink
7 times
OFF 1S
and
blink
3 times
OFF 1S
and
blink
once
OFF 1S
and
blink
twice
OFF 1S
and
blink
4 times
A/C Status
Possible Causes
During cooling and
Outdoor temperature
drying operation,
sensor hasnt been
compressor stops
connected well or
while indoor fan
is damaged. Please
will operate;During
check it by referring
heating operation,
to the resistance
the complete unit will
table for
stop operation.
temperature sensor)
1.Outdoor
During cooling and
temperature sensor
drying operation,
hasnt been
compressor will sop
connected well or is
after operating for
damaged. Please
about 3 mins,
check it by referring
while indoor fan
to the resistance
will operate;During
table for temperature
heating operation, the
sensor)
complete unit will stop
2.The head of
after operating for
temperature sensor
about 3 mins.
hasnt been inserted
into the copper tube
All loads operate
Refer to the
normally,while
malfunction analysis
operation frequency
(overload, high
for compressor is
temperature
decreased
resistant)
All loads operate
The input supply
normally,while
voltage is too low;
operation frequency
System pressure is
for compressor is
too high and
decreased
overload
Overload or
All loads operate
temperature is too
normally, while
high;Refrigerant
operation frequency
is insufficient;
for compressor is
Malfunction of electric
decreased
expansion
valve (EKV)
All loads operate
normally, while
Poor air-return in
operation frequency
indoor unit or fan
for compressor is
speed is too low
decreased
Installation and Maintenance
Service Manual
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