Carrier 42QHF009DS Service Manual page 64

12.3.1.4 Open or short circuit of temperature sensor.
Check the connections
between temperature
sensor and PCB. Are the
sensor and PCB. Are the
Measure the resistance value
Measure the resistance value
of the sensor via Appendix 1
of the sensor via Appendix 1
Replace the indoor PCB
Replace the indoor PCB
12.3.1.5 Full-water malfunction(For cassette / A5 duct)
Power off, then restart the unit 2 minutes
Power off, then restart the unit 2 minutes
later. Is it still displaying the error code?
later. Is it still displaying the error code?
Yes
If the water-level switch
If the water-level switch
is inserted well?
is inserted well?
Yes
If the water-level switch
If the water-level switch
is broken?
is broken?
No
Replace the water pump, If
Replace the water pump, If
malfunction is
malfunction is
solved
solved
Yes
Replace the indoor main PCB
Replace the indoor main PCB
Check the connections
between temperature
connections good?
connections good?
Yes
Is it normal?
Is it normal?
Yes
No
Yes
still not
still not
No Correct the connections.
Correct the connections.
No Replace the sensor.
Replace the sensor.
Insert the water-level switch well
Insert the water-level switch well
Replace the water-level switch
Replace the water-level switch
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