Gree GWH12MB-K3DNE3G Service Manual page 36

Service Manual
Display Method of Indoor Unit
Malfunction
NO. Dual-8
Name
Code
Display
Decrease
frequency
19 due to F9
high air
discharge
Limit/
decrease
20 frequency FH
due to
antifreezing
Voltage for
21 DC bus-bar PH
is too high
Voltage of
22 DC bus-bar PL
is too low
Compressor
Min
23 P0
frequence in
test state
Compressor
rated
24 P1
frequence in
test state
Compressor
maximum
25 P2
frequence in
test state
Installation and Maintenance
Display Method of Outdoor
Indicator has 3 kinds of
Indicator Display (during
display status and during
blinking, ON 0.5s and OFF
blinking, ON 0.5s and OFF
0.5s)
0.5s
Operation Cool Heating Yellow
Indicator Indicator Indicator Indicator
OFF 1S
13 times
OFF 1S
12 times
(during (during
blinking, blinking,
ON ON
0.25s 0.25s
and OFF and OFF
0.25s) 0.25s)
(during (during
blinking, blinking,
ON ON
0.25s 0.25s
and OFF and OFF
0.25s) 0.25s)
(during (during
blinking, blinking,
ON ON
0.25s 0.25s
and OFF and OFF
0.25s) 0.25s)
Unit
Red Green
Indicator Indicator
All loads operate normally,
OFF 1S
while
and
blink
operation frequency for
twice
compressor is decreased
OFF 1S
All loads operate normally,
and
while operation frequency for
blink
compressor is decreased
4 times
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
and
blink
During heating operation, the
complete unit will stop
operation.
During cooling and drying
operation, compressor will stop
and
while indoor fan will operate;
blink
During heating operation, the
complete unit will stop
A/C status Possible Causes
Overload or temperature is too
high;
Malfunction of electric expansion
valve (EKV)
Poor air-return in indoor unit or fan
speed is too low
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, theres malfunction
for the circuit, please replace the
control panel (AP1)
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 normal
range.
2.If the AC input is normal,
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)
Showing during min. cooling or
min. heating test
Showing during nominal cooling or
nominal heating test
Showing during max. cooling or
max. heating test
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