AY-X36RU
AE-X36RU
11
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 blink-
ing, 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
14
Outdoor ambi-
ent tempera-
ture sensor
is open/short
circuited
F3
OFF 3S
and blink
3 times
OFF 1S
and blink
6 times
During cooling and drying operat-
ing, compressor stops while indoor
fan operates; During heating oper-
ation, 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)
15
Outdoor
condenser
temperature
sensor is open/
short circuited
F4
OFF 3S
and blink
4 times
OFF 1S
and blink
5 times
During cooling and drying opera-
tion, compressor stops while indoor
fan will operate; During heating
operation, the complete unit will
stop operation.
Outdoor temperature sensor has
not been connected well or is dam-
aged. Please check it by referring to
the resistance table for temperature
sensor)
16
Outdoor
discharge
temperature
sensor is open/
short circuited
F5
OFF 3S
and blink
5 times
OFF 1S
and blink
7 times
During cooling and drying opera-
tion, compressor will sop 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
has not been connected well or
is damaged. Please check it by
referring to the resistance table
for temperature sensor)
2. The head of temperature sensor
has not been inserted into the
copper tube
17
Limit/ decrease
frequency due
to overload
F6
OFF 3S
and blink
for 6
times
OFF 1S
and blink
3 times
All loads operate normally, while
operation frequency for compres-
sor is decreased
Refer to the malfunction analysis
(overload, high temperature resis-
tant)
18
Decrease fre-
quency due to
overcurrent
F8
OFF 3S
and blink
8 times
OFF 1S
and blink
once
All loads operate normally, while
operation frequency for compres-
sor is decreased
The input supply voltage is too low;
System pressure is too high and
overload
19
Decrease
frequency due
to high air dis-
charge
F9
OFF 3S
and blink
9 times
OFF 1S
and blink
twice
All loads operate normally, while
operation frequency for compres-
sor is decreased
Overload or temperature is too high;
Malfunction of electric expansion
valve (EKV)
20
Limit/ decrease
frequency due
to antifreezing
FH
OFF 3S
and blink
2 times
OFF 3S
and blink
2 times
OFF 1S
and blink
4 times
All loads operate normally, while
operation frequency for compres-
sor is decreased
Poor air-return in indoor unit or fan
speed is too low
21
Voltage for DC
bus-bar is too
high
PH
OFF 3S
and blink
11 times
OFF 1S
and blink
13 times
During cooling and drying opera-
tion, 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 nor-
mal range.
2. If the AC input is normal, mea-
sure the voltage of electrolytic
capacitor C on control panel
(AP1), if its normal, there is mal-
function for the circuit, please
replace the control panel (AP1)
22
Voltage of DC
bus-bar is too
low
PL
OFF 3S
and blink
21 times
OFF 1S
and blink
12 times
During cooling and drying opera-
tion, compressor will stop while
indoor fan will operate; During
heating operation, the complete
unit will stop
1. Measure the voltage of position L
and N on wiring board (XT), if the
voltage is higher than 150VAC,
turn on the unit after the supply
voltage is increased to the nor-
mal range.
2. If the AC input is normal, mea-
sure the voltage of electrolytic
capacitor C on control panel
(AP1), if its normal, there’s mal-
function for the circuit, please
replace the control panel (AP1)
23
Compressor
Min frequence
in test state
P0
(during
blinking,
ON 0.25s
and OFF
0.25s)
(during
blinking,
ON 0.25s
and OFF
0.25s)
Showing during min. cooling or min.
heating test
24
Compressor
rated fre-
quence in test
state
P1
(during
blinking,
ON 0.25s
and OFF
0.25s)
(during
blinking,
ON 0.25s
and OFF
0.25s)
Showing during nominal cooling or
nominal heating test
25
Compressor
maximum fre-
quence in test
state
P2
(during
blinking,
ON 0.25s
and OFF
0.25s)
(during
blinking,
ON 0.25s
and OFF
0.25s)
Showing during max. cooling or
max. heating test
26
Compressor
intermediate
frequence in
test state
P3
(during
blinking,
ON 0.25s
and OFF
0.25s)
(during
blinking,
ON 0.25s
and OFF
0.25s)
Showing during middle cooling or
middle heating test
27
Overcurrent
protection of
phase current
for compressor
P5
OFF 3S
and blink
15 times
During cooling and drying opera-
tion, compressor will stop while
indoor fan will operate; During
heating operation, the complete
unit will stop operation.
Refer to the malfunction analysis
(IPM protection, loss of synchronism
protection and over current protec-
tion of phase current for compres-
sor.