Gree GWC36LB-D1NNA2A/I, Service Manual, Page: 42 / 74

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9. Troubleshooting
9.1 Precautions before Performing Inspection or Repair
Take sufficient care to avoid directly touching any of the circuit parts without first turning off the power.
At times such as when the circuit board is to be replaced, place the circuit board assembly in a vertical position.
Normally,diagnose troubles according to the trouble diagnosis procedure as described below.(Refer to the check points in servicing
written on the wiring diagrams attached to the indoor/outdoor units.)
No. Troubleshooting procedure
1 Confirmation
2 Judgement by Flashing LED of Indoor/Outdoor Unit
3 How to Check simply the main part
9.2 Confirmation
(1)Confirmation of Power Supply
Confirm that the power breaker operates(ON) normally;
(2)Confirmation of Power Voltage
Confirm that power voltage is AC 220–230–240 ± 10%.
If power voltage is not in this range, the unit may not operate normally.
9.3 Judgement by Flashing LED of Indoor/Outdoor Unit
Troubleshooting
Be cautious during installation and maintenance. Do operation following the regulations to avoid electric shock and casualty or
even death due to drop from high attitude.
* Static maintenance is the maintenance during de-energization of the air conditioner.
For static maintenance, make sure that the unit is de-energized and the plug is disconnected.
*dynamic maintenance is the maintenance during energization of the unit.
Before dynamic maintenance, check the electricity and ensure that there is ground wire on the site. Check if there is electric ity on
the housing and connection copper pipe of the air conditioner with voltage tester. After ensure insulation place and the safety, the
maintenance can be performed.
Display Method of Indoor Unit
Indicator lamp
(During blinking, ON for 0.5S and
OFF for 0.5 S)
No. Malfunction Name
Error
Code
Operation
Lamp
COOL
Lamp
HEAT
Lamp
A/C Status Possible Causes
1
Indoor ambient
temperature sensor
is open/short-
circuited
F1
OFF 3S
and blinks
once
The unit will stop operation as it
reaches the temperature point.
During cooling and drying
operation, except indoor fan
operates, other loads stop
operation; During heating
operation, the complete unit stops
operation.
1. The wiring terminal between indoor ambient
temperature sensor and controller is loosened or
poorly contacted;
2. There’s short circuit due to trip-over of the parts on
controller;
3.Indoor ambient temperature sensor is damaged
(Please check it by referring to the resistance table for
temperature sensor)
4. Main board is broken.
2
Indoor evaporator
temperature sensor is
open/short-circuited
F2
OFF 3S
and blinks
twice
The unit will stop operation as it
reaches the temperature point.
During cooling and drying operation,
except indoor fan operates, other
loads stop operation; During heating
operation, the complete unit stops
operation.
1. The wiring terminal between indoor evaporator
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.Indoor evaporator temperature sensor is damaged
(Please check it by referring to the resistance table for
temperature sensor)
4. Main board is broken.
3
Outdoor ambient
temperature sensor is
open/short-circuited
F3
OFF 3S
and blinks
3 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 ambient
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 ambient temperature sensor is damaged
(Please check it by referring to the resistance table for
temperature sensor)
4. Main board is broken.