Gree GWC36LB-D1NNA2A/I, Service Manual

Page: 43 / 74

40
Troubleshooting
4
Outdoor condenser
temperature sensor is
open/short-circuited
F4
OFF 3S
and blinks
4 times
The unit will stop operation as it
reaches the temperature point.
During cooling and drying operation,
compressor stops and indoor fan
operates; During heating operation,
the complete unit stops operation.
1. The wiring terminal between outdoor condenser
temperature sensor and controller is loosened or
poorly contacted;
2. There’s short circuit due to the trip-over of the parts
on controller;
3.Outdoor condenser temperature sensor is damaged
(Please check it by referring to the resistance table for
temperature sensor)
4. Main board is broken.
5
Outdoor discharge
temperature sensor is
open/short-circuited
F5
OFF 3S
and blinks
5 times
The unit will stop operation as it
reaches the temperature point.
During cooling and drying operation,
compressor stops and indoor fan
operates; During heating operation,
the complete unit stops operation.
1. The wiring terminal between outdoor discharge
temperature sensor and controller is loosened or
poorly contacted;
2. There’s short circuit due to the trip-over of the parts
on controller;
3. Outdoor discharge temperature sensor is
damaged. (Please check it by referring to the
resistance table for temperature sensor)
4. Main board is broken.
6
High pressure
protection
E1
OFF 3S and
blinks once
During cooling and drying operation,
except indoor fan operates, all loads
stop operation. During heating
operation, the complete unit stops; if
it is floor standing unit
1. The main board and the display panel are not
connected well.
2. The OVC terminal on main board is not connected
well with the high pressure switch on the complete
unit.
3. The wiring of high pressure switch is loosened.
4. Refrigerant is superabundant;
5. Poor heat exchange (including blocked heat
exchanger and bad radiating environment );
6. Ambient temperature is too high; (if it is 3-phase
unit, the high pressure protection may be caused by
overcurrent protection due to this reason)
7. The supply voltage is abnormal (if it is 3-phase unit,
the high pressure protection may be caused by
overcurrent protection due to this reason)
8. The air intake and air discharge at indoor / outdoor
heat exchanger are not smooth. The air cycle is short
circuited.
9. Filter and heat exchange fins of indoor/outdoor
units are blocked.
10. The system pipeline is blocked.
7 Freeze protection E2
OFF 3S and
blinks twice.
During cooling and drying operation,
compressor and outdoor fan stop
while indoor fan operates.
1. Poor air-return in indoor unit;
2. Abnormal fan speed;
3. Dirty evaporator;
4. System is normal, but the indoor tube temperature
sensor is abnormal, or the tube temperature sensor is
not connected well.
8
Low pressure protection
of compressor
E3
OFF 3S and
blinks 3
times.
The complete unit stops
1. The main board and display panel are not
connected well.
2. The LPP terminal on the main board is not
connected well with the high pressure switch on the
complete unit.
3. The wiring of the high pressure switch is loosened.
High pressure switch is damaged or poorly contacted.
4. Insufficient or leaking out refrigerant.
5. Check whether LPP input is high level.
9
High discharge
temperature protection
of compressor
E4
OFF 3S and
blinks 4
times
During cooling and drying operation,
compressor and outdoor fan stop
while indoor fan operates. During
heating operation, all loads stop.
1. Abnormal system (e.g.: blockage, etc)
2. Abnormal rotation speed of outdoor motor
(cooling )
3. Abnormal air intake (cooling)
4. System is normal, but the compressor discharge
temperature sensor is abnormal or poorly contacted.
10
Communication
malfunction
E6
OFF 3S and
blinks 6
times
During cooling operation, compressor
stops while indoor fan motor
operates. During heating operation,
the complete unit stops.
1. The communication line is not connected tightly or
poorly contacted.
Poor contact of any line may cause communication
malfunction.
2. The match between main board and display panel
is incorrect. Indoor and outdoor unit boards are
matched incorrectly.
3. Incorrect wire connection.
4. Controller is damaged.