Precautions Before Performing Inspection Or Repair; Troubleshooting Procedure; Judgement By Flashing Led Of Indoor/Outdoor Unit - Gree GWC36LB-D1NNA2A/I Service Manual

Troubleshooting
9. Troubleshooting

9.1 Precautions before Performing Inspection or Repair

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.
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
No. Malfunction Name Error
Code
Indoor ambient
temperature sensor
1
is open/short-
circuited
Indoor evaporator
2 temperature sensor is
open/short-circuited
Outdoor ambient
temperature sensor is
3
open/short-circuited
Display Method of Indoor Unit
Indicator lamp
(During blinking, ON for 0.5S and
OFF for 0.5 S)
Operation COOL
Lamp Lamp
OFF 3S
and blinks
F1
once
OFF 3S
F2 and blinks
twice
OFF 3S
F3 and blinks
3 times
A/C Status
HEAT
Lamp
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.
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.
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.
Possible Causes
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.
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.
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.
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