Mitsubishi Electric M Z-C NA Series, Руководство по обслуживанию

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33
Check of float sensor
E
When the left lamp of OPERATION INDICATOR lamp blinks 9-time.
Indoor unit and outdoor unit do not operate.
Connect the lead wire.
Indoor electronic control P.C. board
CN1N1
CN145
C111
Turn OFF the power supply and check
connectors CN145 and CN1N1 visually.
Disconnect float sensor from CN145 of
indoor electronic control P.C. board.
Measure the resistance between and .
Is the drain pump
operating?
Turn ON the power supply. Press the
emergency operation switch (COOL) and
perform emergency COOL operation.
Measure the voltage between CN1N1
and .
Yes Yes
No
No
Is there 208/230 V AC
between CN1N1 and
?
Is there large amount
of water in drain pan?
*1 Refer to 9-5. when
float sensor can be checked.
Yes
Replace the indoor
electronic control P.C. board.
Replace the indoor
electronic control P.C. board.
Replace the indoor
electronic control P.C. board.
Check power supply voltage.
No
Replace the float sensor.
Yes
Remove clog from drain
hose.
No
Replace the drain pump.
No
No
Is the drain hose
clogged?
Yes
Yes
Yes
No
Replace the indoor
electronic control P.C. board.
Are the lead wires
disconnected?
Are there abnormality in
the soldering part of
connectors?
Is the resistance 1Ω or
less? *1
OBH802B