Af" Indoor Unit: Drain Level Above Limit - Panasonic U-4..6ML5XPQ Service Manual

Troubleshooting by Indication on the Remote Controller
AF
" " Indoor Unit:
3.8
AF
Remote
Controller
Display
Applicable LM3, FM3, DM3, EM3
Models
Method of Water leakage is detected based on float switch ON/OFF operation while the compressor is in
non-operation.
Malfunction
Detection
Malfunction When the float switch changes from ON to OFF while the compressor is in non-operation.
Decision
Conditions
Supposed
Causes
Troubleshooting
152
Drain Level above Limit
Humidifier unit (optional accessory) leaking
Defect of drain pipe (upward slope, etc.)
Defect of indoor unit PC board
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Field drain
piping has a defect such as
upward sloping.
NO
A humidifier
unit (optional accessory)
is installed on the
indoor unit.
NO
YES
YES
Urban Multi ML5 · Mini UM · Heat Pump
Modify the drain piping.
Check if the humidifier unit is
leaking.
Defect of indoor unit PC board.
Troubleshooting
(V2782)