15
MICROPROCESSOR CONTROL
10
MUX-A22WV -
E1
OUTDOOR UNIT ACTUATOR CONTROL
ACTUATOR
ON
OFF
ON
OFF
ON
OFF
ON (OPEN)
OFF (CLOSE)
ON (OPEN)
OFF (CLOSE)
ON (CLOSE)
OFF (OPEN)
SOLENOID VALVE
INDOOR UNIT
MC1
MC2
MF61
21R3
21R4
21RB
COMPRESSOR
OUTDOOR
FAN MOTOR
A
ON
OFF
–
–
–
–
OFF
–
–
–
–
–
–
–
–
B
–
–
ON
ON
OFF
OFF
ANY UNIT ON
OFF
ON
OFF
–
–
ON
ON
OFF
OFF
C
–
–
ON
OFF
ON
OFF
OFF
–
–
ON
OFF
ON
OFF
ON
OFF
MUX-A22WV -
E1
“–” means that the indoor unit is not related to the control of actuator.
TROUBLESHOOTING
11
Lead wiring
Housing point
11-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.
1) Before servicing the air conditioner, first be sure to turn off the remote controller to stop the unit, and then after con-
firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
MUX-A22WV -
E1
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
3) When troubleshooting, refer to the flow chart on page 16.
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