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Carrier 42QHF009DS seires Service Manual page 25

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7 Water-level alarm malfunction diagnosis and solution
Error Code
Malfunction decision conditions
Supposed causes
Power off, then restart the unit 3 minutes
Power off, then restart the unit 3 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
solved
solved
Yes
Replace the indoor main PCB
Replace the indoor main PCB
EE
If the sampling voltage is not 5V, the LED will display the failure.
● Wiring mistake
● Water-level switch faulty
● Water pump faulty
● Indoor PCB faulty
No
Yes
still
not
is
still
not
Insert the water-level switch well
Insert the water-level switch well
Replace the water-level switch
Replace the water-level switch
10

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