Daikin R407C PLUS - Indoor Unit: Drain Level above Limit

Si33-105 Troubleshooting
Troubleshooting R407C PLUS Series Heat Recovery System 163
3.7 Indoor Unit: Drain Level above Limit
Remote
Controller
Display
AF
Supposed
Causes
!
Humidifier unit (optional accessory) leaking
!
Defect of drain pipe (upward slope, etc.)
!
Defect of indoor unit PC board
Troubleshooting
Defect of indoor unit PC board.
Modify the drain piping.
YES
YES
Check if the humidifier unit is
leaking.
NO
NO
Field drain
piping has a defect such as
upward sloping.
A humidifier
unit (optional accessory) is
installed on the
indoor unit.
(VF034)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.