Temperature Sensor Malfunction - Friedrich MWM09Y1J Service & Parts Manual

TROUBLESHOOTING

Temperature sensor malfunction

Is outdoor ambient temperature within the normal range?
Is indoor and outdoor fan running normally?
Is the radiating environment inside and outside the unit good enough?
Energize the
unit and start
it
Indoor unit
display F1/F2
N
Indoor unit
display F4/F5
Y
Check connecting state of
outdoor temperature sensor
Reliable
connected?
Y
Replace
Tesmepnesroar
ture Sensor
Remove error?
N
Replace parts
of outdoor
electric box
100
Check connecting
state of indoor
Y
temperature
sensor
Adjust
N
connecting state
N
Remove error?
Y
Y
reliable
connected?
Y
Replace
temperature
sensor
Remove error?
N
Replace main
boarudn iotf indoor
Finish
N
Adjust
connecting state
N
Remove error?
Y