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(2) Checking the mis-wiring and serial signal error (Only MXZ-32NV)
<The outdoor unit does not operate.>
Single or repeated blinks appears on the operation indicator (on the left-hand side).
Using the light emitting diode LED1 on the indoor controller board (See the indoor unit service manual) ,
locate the defect in the following procedure.
After checking the indoor unit, check the outdoor unit as follows. For the
indoor unit inspection, refer to the appropriate service manual.
Measure the voltage between the appropriate connector
terminals on the outdoor controller board depending on
the indoor unit indicating the serial signal error.
• When the indoor unit for Room A is indicating the serial
signal error : Is there voltage of 5 to 10 V DC between
pin 1 (+) and pin 2 (-) at connector CN601?
• When the indoor unit for Room B is indicating the serial
signal error : Is there voltage of 5 to 10 DC between pin
1 (+) and pin 2 (-) at connector CN602?
• When the indoor unit for Room C is indicating the serial
signal error : Is there voltage of 5 to 10 DC between pin
1 (+) and pin 2 (-) at connector CN603?
• When the indoor unit for Room D is indicating the serial
signal error : Is there voltage of 5 to 10 DC between pin
1 (+) and pin 2 (-) at connector CN604?
Yes
Outdoor controller board
42
Yes
No
Check
the
indoor/outdoor
connecting wire, the unit signal
1 wire, and the outdoor
terminal block.
• Reactor
• Diode stack
• Power factor capacitor
• Smoothing capacitor
• Rush current control circuit
• IPM board
Disconnect the short circuit between tab
terminals as before. Is the LED1 lighting on
the outdoor controller board?
No lighting
Is there 12 V DC between pin
Yes
1 and pin 2 at connector
CN801
on
controller board?
No
}
faulty
the
outdoor
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