Gree GWH18YD-K6DNA2A Service Manual page 57

the indoor in heating mode
Malfunction indicator of outdoor unit
check points:
tube temperature sensor of indoor and outdoor unit normal
Shut down the power and wait 20min
Replace corresponding control board (replace outdoor
control board in cooling mode and replace indoor control
board in heating mode)
54
Check
Overload and high
temperature protection
Is outdoor ambient temperature
in cooling mode ? /Is indoor and outdoor
higher than 53
ambient temperature too high in
heating mode?
N
Is heat dissipation of the indoor unit
and outdoor unit abnormal?
N
Does the indoor and outdoor fan
work normally?
Y
Check if the temperature sensor is normal
according to the Resistance Table of Tube
Temperature Sensors(check outdoor tube
temperature in cooling mode and check
indoor tube temperature in heating mode)
Y Is the tube temperature sensor normal?
N
Replace corresponding
tube temp. sensor
End
unit in cooling mode and check
(including if the fan speed is too low)
Normal protection, please operate
Y
it after the outdoor ambient temp-
erature is normalized.
Improve the heat dissipation
Y
environment of the unit
1. Check if the fan terminal
OFAN is connected correctly
N
2. If the indoor and outdoor
motor is broken
Replace the fan
capacitor C1
Replace the
outdoor fan
Service Manual
Installation and Maintenance