Indoor Unit: Malfunction Of Drain Level Control System (33H) - Panasonic Urban Multi MX1R Series Service Manual

Troubleshooting
3.3 Indoor Unit:
A3
Remote Controller
Display
„ Defect of float switch or short circuit connector
Supposed Causes
„ Defect of drain pump
„ Drain clogging, upward slope, etc.
„ Defect of indoor unit PC board
„ Loose connection of connector
Troubleshooting
500
Malfunction of Drain Level Control System (33H)
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
The float
switch is connected to
X18A of the indoor unit
PC board.
YES
The float
switch contact is
forming a short circuit
(continuity check with
X18A disconnected)
NO
Water builds up
in the drain pan.
YES
The drain
pump is connected to
X25A or terminals X8S
and X9S of the indoor
unit PC board.
YES
The drain
pump works when
the power supply is reset
for the indoor unit.
NO
The voltage
of terminals X8S and
X9S or X25A is 220~240 V
(within 5minutes of
resetting the
power
supply).
YES
A short
NO
circuit connector is
connected to X18A.
Becomes
YES normal when X18A of
the indoor unit PC board
is short circuited
YES
NO
The float switch
functions normally.
YES
NO
YES
NO
Troubleshooting UM Combination "MA1R Series" Using R-407C
PACD011001C2
NO
Connect either a short circuit
connector or float switch and turn on
again.
NO
Defect of indoor unit PC board.
Loose connection of connector.
NO
Replace float switch.
Modify the float switch's connection
and turn on again.
Connect the drain pump and turn on
again.
Check the drain piping for clogging or
upward slope, etc.
Replace indoor unit PC board.
Replace the drain pump or check for
dirt, etc.
(VF030)