Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 94
3.7 “AF” Indoor Unit: Drain Level above Limit
Remote
Controller
Display
AF
Applicable
Models
FCQ
Method of
Malfunction
Detection
Water leakage is detected based on float switch ON/OFF operation while the compressor is in
non-operation.
Malfunction
Decision
Conditions
When the float switch changes from ON to OFF while the compressor is in non-operation.
Supposed
Causes
 Humidifier unit (optional accessory) leaking
 Defect of drain pipe (upward slope, etc.)
 Defect of indoor unit P.C.B.
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Defect of indoor unit P.C.B.
Modify the drain piping.
YES
NO
NO
Field drain
piping has a defect such as
upward sloping.
Check if the humidifier unit is
leaking.
YES
A humidifier
unit (optional accessory)
is installed on the
indoor unit.