Service Functions; Troubleshooting - Mitsubishi Electric MUZ-A09YV-E1 Service Manual

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10

SERVICE FUNCTIONS

MUZ-A09YV -
E1
MUZ-A09YVH -
E1
CHANGE IN DEFROST SETTING
<JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed.
(Refer to page 32.)
Jumper wire
none
(cut)
JS
soldered
11

TROUBLESHOOTING

MUZ-A09YV -
E1
MUZ-A09YVH -
E1
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, be sure to first turn off the remote controller to stop the main unit, 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 the flow chart on page 23 and check table on page 24.
MUZ-A12YV -
E1
MUZ-A12YVH -
E1
Defrost finish temperature
(Initial setting)
8:
5:
MUZ-A12YV -
E1
MUZ-A12YVH -
E1
Lead wiring
www.ilmalämpöpumput.com
Model
(Serial number 4000531~)
MUZ-A09YVH -
E1
(Serial number 4000211~)
MUZ-A12YVH -
E1
MUZ-A09YV -
E1
MUZ-A12YV -
E1
MUZ-A09YVH -
(Serial number ~4000530)
E1
MUZ-A12YVH - (Serial number ~4000210)
E1
Housing point
22