Carrier 40MB C Series Service Manual page 24

Water−level alarm malfunction diagnosis and solution
Error Code
Malfunction decision conditions
Supposed causes
EE
If the sampling voltage is not 5V, the LED will display the failure.
S
Wiring mistake
S
Water-level switch faulty
S
Water pump faulty
S
Indoor PCB faulty
Fig. 31 – Troubleshooting
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