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Mitsubishi Electric Plasma Quad Connect MAC-100FT-E Service Manual page 6

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4.1.2 When the other interface is also connected
Operation check of the Plasma Quad Connect
(when the other interface is also connected)
Turn the air conditioner ON.
Does the air conditioner (main unit) work?
Is the operation lamp of the Plasma Quad Connect
lit?
Measure the voltage between L and N on the
terminal block of the Plasma Quad Connect.
Is it 230 V (±10%) or less?
Is the DIP switch set to the mode for when the
other interface is also connected?
(Is the SW11-1 set to ON?)
Is the LED 74 of the Plasma Quad
Connect blinking orange?*
Replace the Plasma Quad Connect.
* It will take up to about 3 minutes before the LED starts blinking orange after turning on the breaker.
OBH901
YES
NO
YES
YES
YES
NO
Perform failure diagnosis of the air conditioner
(main unit).
YES
Perform failure diagnosis of the Plasma Quad
Connect (4.2).
NO
Check the wiring to the breaker and the voltage of
the breaker.
NO
Turn off the breaker, switch the DIP switch to the mode for
when the other interface is also connected (switch the
SW11-1 to ON), then perform the operation check again.
NO
Check the followings.
Connection between CN105 of the indoor
unit and the Plasma Quad Connect
Connection between the Plasma Quad
Connect and the other connected interface
If the other interface operates normally
(For checking method, refer to the handbook of
each interface.)
If there is no problem on the above items,
replace the Plasma Quad Connect.
6

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