How To Check Mis-Wiring - Mitsubishi Electric Mr.Slim MSH24WN Service Manual

Split-type, heat pump air conditioners wireless type
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When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
Outdoor unit doesn't operate.

How to check mis-wiring

G
Rectify the wiring.
Correct the mis-wiring.
Replace the indoor electronic
control P.C. board.
Start
Turn OFF the power supply.
Turn ON the power supply.
No
Is the power voltage to terminal blocks of
indoor/outdoor units normal?
Turn ON the EMERGENCY OPERATION switch.
(any mode possible)
After 3 minutes that power supply has
been turned on, does the compressor
start operating?
No
Is the terminal blocks 1 1 and 3 3 on the
indoor unit properly connected to their
counter parts on outdoor unit?
Turn OFF the power supply.
Check by using checking mode.
1 1 Disconnect indoor/outdoor wiring (at indoor terminal blocks 1 1 and 3 3 )
2 2 Short circuit between indoor terminal blocks 1 1 and 3 3 .
Turn ON the power supply.
3 3 While pressing the OPERATION SELECT button and the TOO
COOL button on the remote controller, press the RESET button on
the remote controller.
4 4 Release the RESET button on the remote controller.
(After 3 seconds, LCD on the remote controller displays all signs.)
Press the OPERATE/STOP(ON/OFF) button on
the remote controller to send signal.
Make sure the unit emits a beep tone.
No
Does the OPERATION INDICATOR
lamp on the indoor unit flash on?
Replace the deicer P.C.board.
Before the unit resumes normal operation.
•Release the checking mode by pressing the
RESET button on the remote controller, and then
send the unit signal to stop operation.
•Turn OFF the power supply to indoor/outdoor
units.
•Get indoor terminal blocks 1 1 and 3 3 opened, and
reconnect indoor/ outdoor wiring.
[
Be sure to turn OFF the power supply to
indoor/outdoor units in replacing P.C. board.
39
Yes
Yes
No
Yes
Yes
]
OK

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