Gree GUHD09NK3FO Service Manual page 90

F3 Malfunction of Outdoor Ambient Temperature Sensor
if the outdoor ambient
temperature sensor on mainboard
is inserted on the needle stand
the temperature sensor and
measure if its resistance is
F4 Malfunction of Discharge Temperature Sensor
discharge temperature sensor on
mainboard is inserted on the
the temperature sensor and
measure if its resistance is
Malfunction of
outdoor ambient
temperature
sensor
Check
correctly
Yes
Disconnect
normal
Yes
Replace the
outdoor
mainboard
Malfunction of
discharge
temperature
sensor
Check if the
needle stand correctly
Yes
Disconnect
normal
Yes
Replace the
outdoor
mainboard
Correctly insert the
No
temperature sensor on
the needle stand
No
Replace the
temperature sensor
Correctly insert the
No
temperature sensor
on the needle stand
Replace the
No
temperature sensor
U-Match Series DC
Inverter Service Manual
87