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Procedure Of Failure Diagnosis - Mitsubishi Electric Plasma Quad Connect MAC-100FT-E Service Manual

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4

Procedure of failure diagnosis

Check the following items when the Plasma Quad Connect or the other connected inter-
face does not work properly.
4.1 Checking method when the Plasma Quad Connect does not work properly
Perform operation check of the Plasma Quad Connect according to the following flow chart.
4.1.1 When only the Plasma Quad Connect is connected
Operation check of the Plasma Quad Connect
(when only the Plasma Quad Connect is connected)
Turn on the air conditioner.
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 only
the Plasma Quad Connect is connected?
(Is theSW11-1 set to OFF?)
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.
Turn off the breaker, switch the DIPswitch to the mode
NO
for when only the Plasma Quad Connect is connected
(switch the SW11-1 to OFF), then perform the operation
check again.
NO
Check the connection of CN105 of the indoor unit.
If it is connected properly, replace the Plasma
Quad Connect.
5

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