Service Functions; Troubleshooting - Mitsubishi Electric SUZ-KA25VA Technical & Service Manual

11

SERVICE FUNCTIONS

SUZ-KA25VA.TH
SUZ-KA25VAH.TH SUZ-KA35VAH.TH
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 12-6-1.)
Jumper wire
soldered
(Initial setting)
JS
none
(cut)
Serial No.
12

TROUBLESHOOTING

SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH
SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH
SUZ-KA50VA .TH SUZ-KA60VA
1
12-1. 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 turn OFF the main unit first with the remote controller, and turn off the
breaker.
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 is blinking on and off to indicate an abnormality. To make sure,
check how many times the abnormality indication is blinking 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 12-2. and 12-3.
SUZ-KA35VA.TH
SUZ-KA25VA.TH SUZ-KA25VAH.TH
5:
8: 15:
—
.TH SUZ-KA71VA
1
Lead wire
Defrost finish temperature
SUZ-KA35VA.TH
8: 10:
13:
— —
.TH
1
Housing point
51
SUZ-KA35VAH.TH
13: 10:
15: 13:
~67P00330 68P00331~