Carrier 40GRQB12B-3 - Indoor Unit Troubleshooting Charts; Malfunction of Temperature Sensor F1, F2; Troubleshooting for Main Malfunction

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TROUBLESHOOTING FOR MAIN MALFUNCTION
Indoor Unit
1. Malfunction of Temperature Sensor F1, F2
Troubleshooting for
F1,F2 malfunction
Is
the wiring terminal between the
temperature sensor and the controller
loosened or poorly contacted?
Insert the temperature
sensor tightly
Yes
Is malfunction
eliminated
Is there a short circuit?
-
Make sure all parts
fastened tight
Is malfunction
eliminated
Replace the mainboard
with the same model.
End
No
Is the
temperature sensor normal according
to the Resistance
Table ?
Replace it with a
temperature sensor
with the same model
Is malfunction
removed
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Fig. 25 – Troubleshooting