Troubleshooting For Main Malfunction - Lennox LI009HI-230P432 Service Manual

9.2 Troubleshooting for Main Malfunction

Malfunction of Temperature Sensor F1, F2
●Indoor unit:
1. Malfunction of Temperature Sensor F1, F2
Main detection points:
Is.the.wiring.terminal.between.the.temperature.sensor.and.the.controller.loosened.or.poorly.contacted?
● Is the wiring terminal between the temperature sensor and the controller loosened or poorly contacted?
Is.there.short.circuit.due.to.trip-over.of.the.parts?
● Is there short circuit due to trip-over of the parts?
Is.the.temperature.sensor.broken?
● Is the temperature sensor broken?
Is.mainboard..broken?
● Is mainboard broken?
Malfunction diagnosis process:
68
Troubleshooting for
F1,F2 malfunction
Start
Is
the wiring terminal between the
Is the wiring terminal between the
temperature sensor and the controller
temperature sensor and the controller
loosened or poorly contacted?
loosened or poorly contacted?
no
No
Is there short circuit due to trip - over of
the parts?
Is there short circuit due to trip-
over of the parts
no
No
Is the
temperature sensor normal according
to the Resistance
Table?
Is the temperature sensor normal
according to the resistance table?
yes
Yes
No
Replace the mainboard
with the same model.
Replace the mainboard with
the same model.
End
End
yes
Yes
Insert the temperature
sensor tightly
Insert the temperature
sensor tightly
Is malfunction
no
eliminated
No Is malfunction
eliminated
yes
Yes
Make the parts upright
Make the parts upright
Is malfunction
no
eliminated
No Is malfunction
eliminated
no
No
Replace it with a
temperature sensor
with the same model
Replace it with a
temperature sensor with
the same model
Is malfunction
no
removed
Is malfunction
eliminated
yes
Yes
Service Manual
yes
Yes
Yes
yes
Installation and Maintenance