Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
87 Troubleshooting
3.3 “A3” Indoor Unit: Malfunction of Drain Level Control
System (S1L)
Remote
Controller
Display
A3
Applicable
Models
FCQ, FHQ (Option), FAQ (Option)
Method of
Malfunction
Detection
Float switch OFF detection
Malfunction
Decision
Conditions
When rise of water level is not a condition and the float switch goes OFF.
Supposed
Causes
 208~230V power supply is not provided
 Defect of float switch or short circuit connector
 Defect of drain pump
 Drain clogging, upward slope, etc.
 Defect of indoor unit P.C.B.
 Loose connection of connector