Gree GWH09TB-D3DNA1A Service Manual page 56

Display Method of Indoor Unit
Malfunction
NO.
Name
Indicator Display (during
Dual-8
blinking, ON 0.5s and OFF 0.5s)
Code
Operation
Display
Indicator
Indoor
evaporator
temperature
11 F2
sensor is
open/short
circuited
Outdoor
ambient
temperature
12 F3
sensor is
open/short
circuited
Outdoor
condenser
temperature
13 F4
sensor is
open/short
circuited
Outdoor
discharge
temperature
14 F5
sensor is
open/short
circuited
Limit/
decrease
15
frequency F6
due to
overload
Decrease
frequency
16
F8
due to
overcurrent
Decrease
frequency
17 due to F9
high air
discharge
Voltage for
18
DC bus-bar PH
is too high
Malfunction
of complete
19 U5
units current
detection
Display Method of
Outdoor Unit
(Indicator has 3 kinds
of display status and
they will be displayed
circularly every 5s.)
□OFF
■Illuminated
Cool Heating D5 D6
Indicator Indicator
(D40) (D41)
OFF 3S
and
blink
twice
OFF 3S
and
blink
3 times
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
and
blink
11 times
OFF 3S
and
blink
13 times
A/C status
Blink
D16 D30
(D42) (D43)
AC stops operation once
reaches the setting
temperature. Cooling, drying:
internal fan motor stops
operation while other loads
stop operation; heating: AC
stop operation
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation, the
complete unit will stop operation
During cooling and drying
operation, compressor stops
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
During cooling and drying
operation, 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.
All loads operate normally, while
operation frequency for
compressor is decreased
All loads operate normally, while
operation frequency for
compressor is decreased
All loads operate normally, while
operation frequency for
compressor is decreased
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
During cooling and drying
operation, the compressor will
stop while indoor fan will operate;
During heating operating,
the complete unit will stop
operation.
Possible Causes
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.
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
1.Outdoor temperature sensor
hasnt been connected well or is
damaged. Please check it by
referring to the resistance table for
temperature sensor)
2.The head of temperature sensor
hasnt been inserted into the
copper tube
Refer to the malfunction analysis
(overload, high temperature
resistant)
The input supply voltage is too
low;
System pressure is too high and
overload
Overload or temperature is too
high;
Malfunction of electric expansion
valve (EKV)
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 . I f t h e A C i n p u t i s n o r m a l ,
measure the voltage of electrolytic
capacitor C on control panel (AP1),
if its normal, theres malfunction
for the circuit, please replace the
control panel (AP1)
Theres circuit malfunction on
outdoor units control panel AP1,
please replace the outdoor units
control panel AP1.