SiE 00-07
Troubleshooting
Troubleshooting R-407C PLUS Series
129
3.3
Indoor Unit: Malfunction of Drain Level Control System (33H)
Remote Controller
Display
A3
Supposed Causes
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
Troubleshooting
(VF030)
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.
Connect either a short circuit
connector or float switch and turn on
again.
YES
YES
YES
YES
Defect of indoor unit PC board.
Loose connection of connector.
NO
NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
NO
The float
switch is connected to
X18A of the indoor unit
PC board.
NO
The drain
pump works when
the power supply is reset
for the indoor unit.
The drain
pump is connected to
X25A or terminals X8S
and X9S of the indoor
unit PC board.
The voltage
of terminals X8S and
X9S or X25A is 220~240 V
(within 5minutes of
resetting the
power
supply).
Water builds up
in the drain pan.
The float
switch contact is
forming a short circuit
(continuity check with
X18A disconnected)
A short
circuit connector is
connected to X18A.
Becomes
normal when X18A of
the indoor unit PC board
is short circuited
The float switch
functions normally.
Summary of Contents for FXYBP20K7V1
Page 1: ...System R 407C PLUS Series Service Manual SiE 00 07 ...
Page 11: ...Introduction SiE 00 07 x ...
Page 17: ...Product Outline SiE 00 07 6 General Information R 407C PLUS Series ...
Page 41: ...Specifications SiE 00 07 30 Specifications R 407C PLUS Series ...
Page 119: ...Test Operation SiE 00 07 108 Test Operation R 407C PLUS Series ...
Page 132: ...SiE 00 07 Troubleshooting by Remote Controller Troubleshooting R 407C PLUS Series 121 ...
