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10
SERVICE FUNCTIONS
MUZ-FA25VA
MUZ-FA35VA
MUZ-FA25VAH MUZ-FA35VAH
CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed.
(Refer to 11-7.1.)
Jumper wire
soldered
(Initial setting)
JS
none
(cut)
11
TROUBLESHOOTING
MUZ-FA25VA
MUZ-FA35VA
MUZ-FA25VAH MUZ-FA35VAH
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 of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after
confirming 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 electrical parts, be careful to the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
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) Before servicing check that the connector and terminal are connected properly.
3) 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.
4) When troubleshooting, refer to 11-2., 11-3. and 11-4.
MUZ-FA25VA
MUZ-FA25VAH
5:
8:
8:
15:
Lead wiring
Defrost finish temperature
MUZ-FA35VA
(Serial number :
~6002550)
10:
13:
13:
15:
Housing point
26
MUZ-FA35VAH
(Serial number :
6002551~)
10:
13:
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