A3" Indoor Unit: Malfunction Of Drain Level Control System (S1L) - Panasonic U-4..6ML5XPQ Service Manual

Troubleshooting by Indication on the Remote Controller
A3
" " Indoor Unit:
3.3
System (S1L)
A3
Remote
Controller
Display
LM3, UM4, FXSQ, DM3, NM3, EM3, TM3 (Option), 200..250EM3 (Option), KM3 (Option)
Applicable
Models
Method of By float switch OFF detection
Malfunction
Detection
Malfunction When rise of water level is not a condition and the float switch goes OFF.
Decision
Conditions
Supposed
Causes
144
Malfunction of Drain Level Control
220~240V 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 PC board
Loose connection of connector
Urban Multi ML5 · Mini UM · Heat Pump
Troubleshooting