Gree GWC12ATCXB-A3DNA1C/I - Page 61

58
Installation and Maintenance
Service Manual
No. Malfunction Name
Display Method of
Indoor Unit
A/C status Possible Causes
Dual-8 Code
Display
11
Indoor ambient
temperature sensor is
open/short circuited
F1
During cooling and drying operation, indoor
unit operates while other loads will stop; during
heating operation, the complete unit will stop
operation.
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.
12
Indoor evaporator
temperature sensor is
open/short circuited
F2
AC stops operation once reaches the setting
temperature. Cooling, drying:
internal fan motor stops operation while other
loads stop operation; heating: AC
stop operation
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.
13
Outdoor ambient
temperature sensor is
open/short circuited
F3
During cooling and drying operating, compressor
stops while indoor fan operates; During heating
operation, 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)
14
Outdoor condenser
temperature sensor is
open/short circuited
F4
During cooling and drying operation, compressor
stops while indoor fan will operate; During heating
operation, 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)
16
Outdoor discharge
temperature sensor is
open/short circuited
F5
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.
1.Outdoor temperature sensor hasn't been
connected well or is damaged. Please check it by
referring to the resistance table for temperature
sensor)
2.The head of temperature sensor hasn't been
inserted into the copper tube
17
Limit/decrease frequency
due to overload
F6
All loads operate normally, while operation
frequency for compressor is decreased
Refer to the malfunction analysis (overload, high
temperature resistant)
18
Decrease frequency due
to overcurrent
F8
All loads operate normally, while operation
frequency for compressor is decreased
The input supply voltage is too low;
System pressure is too high and overload
19
Decrease frequency due
to high air discharge
F9
All loads operate normally, while operation
frequency for compressor is decreased
Overload or temperature is too high;
Refrigerant is insufcient;
Malfunction of electric expansion valve (EKV)
20
Limit/decrease frequency
due to antifreezing
FH
All loads operate normally, while operation
frequency for compressor is decreased
Poor air-return in indoor unit or fan speed is too
low