Carrier 38MGRBQ18B-3 - DIAGNOSIS AND SOLUTION (CONT); Water-Level Alarm Malfunction

38MGRBQ: Service Manual
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DIAGNOSIS AND SOLUTION (CONT)
Water-level alarm malfunction diagnosis and solution
Troubleshooting
ERROR CODE
REFER TO INDOOR UNIT SERVICE MANUAL
MALFUNCTION DECISION
CONDITIONS
If the sampling voltage is not 5V, the LED displays the failure code.
SUPPOSED CAUSES
Wiring mistakes
Faulty water-level switch
Faulty water pump
Faulty indoor PCB
-
Is the water-level switch
inserted well?
No
-
Insert the water level switch well-
-
Is the water
-level switch
broken?
Yes
-
Replace the water-level switch
,
Replace the water pump. Is
the malfunction still
unresolved?
Yes
No
Yes
Replace the indoor main PCB.
,
s
.
?
Power off, then restart the unit 3 minutes
later. Is it still displaying the error code?
Yes