Gree GWH12MB-K3DNE3G Service Manual page 35

Display Method of Indoor Unit
Indicator Display (during
Malfunction
blinking, ON 0.5s and OFF
Dual-8
NO.
Name
0.5s)
Code
Display
Operation
Indicator
Gathering
11 Fo
refrigerant
Indoor
ambient
temperature
12 F1
sensor is
open/short
circuited
Indoor
evaporator
temperature
13 F2
sensor is
open/short
circuited
Outdoor
ambient
temperature
14 F3
sensor is
open/short
circuited
Outdoor
condenser
temperature
15 F4
sensor is
open/short
circuited
Outdoor
discharge
temperature
16 F5
sensor is
open/short
circuited
Limit/
decrease
17 frequency F6
due to
overload
Decrease
frequency
18 F8
due to
overcurrent
32
Display Method of Outdoor
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
Cool Heating Yellow
Indicator Indicator Indicator Indicator
OFF 1S
and blink
17 times
OFF 1S
6 times
OFF 1S
5 times
OFF 1S
7 times
OFF 1S
3 times
OFF 1S
Unit
A/C status
Red Green
Indicator
When the outdoor unit receive
signal of Gathering refrigerant
,the system will be forced to
run under cooling mode for
gathering refrigerant
During cooling and drying
operation, indoor unit operates
while other loads will stop;
during heating operation,
the complete unit will stop
operation.
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
and
while indoor fan operates;
blink
During heating operation,
the complete unit will stop
operation
During cooling and drying
operation, compressor stops
and while indoor fan will operate;
blink During heating operation,
the complete unit will stop
operation.
During cooling and drying
operation, compressor will sop
after operating for about 3
and mins,
blink while indoor fan will operate;
During heating operation, the
complete unit will stop after
operating for about 3 mins.
All loads operate normally,
and while
blink operation frequency for
compressor is decreased
All loads operate normally,
and while
blink operation frequency for
once compressor is decreased
Service Manual
Possible Causes
Nominal cooling mode
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.
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
Installation and Maintenance