Check Of Float Sensor - Mitsubishi Electric MLZ-KP25VF Service Manual

When the left lamp of OPERATION INDICATOR lamp flashes 9-time.
Indoor unit and outdoor unit do not operate.

Check of float sensor

E
Connect the lead wire.
*1 Refer to 11-5. when
float sensor can be checked.
Indoor electronic control P.C. board
C111
OBH801
Turn OFF the power supply and check
connectors CN145 and CN1N1 visually.
Yes
Are the lead wires
disconnected?
No
Disconnect float sensor from CN145 of
indoor electronic control P.C. board.
Measure the resistance between
less? *1
Is there large amount
of water in drain pan?
Turn ON the power supply. Press
EMERGENCY OPERATION switch
(COOL) and perform emergency COOL
operation. Measure the voltage between
CN1N1 and
Is there 230 V AC
between CN1N1
?
Is the drain pump
operating?
Is the drain hose
clogged?
Replace the indoor
electronic control P.C. board.
CN1N1
CN145
Are there abnormality in
the soldering part of
connectors?
No
and .
Yes
Replace the indoor
electronic control P.C. board.
No
No
Replace the float sensor.
Yes
.
Replace the indoor
No
and electronic control P.C. board.
Check power supply voltage.
Yes
No
Replace the drain pump.
Yes
Yes
Remove clog from drain
hose.
No
35
Yes
Replace the indoor
electronic control P.C. board.