Service Functions; Troubleshooting - Mitsubishi Electric SUZ-KA25VA5 Service Manual

9

SERVICE FUNCTIONS

SUZ-KA25VA5.TH
SUZ-KA25VA5.TH-ET
SUZ-KA60VA5.TH
SUZ-KA60VA5.TH-ET
CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to "10-6-1.
Inverter P.C. board".)
Jumper wire
Soldered (Initial setting)
JS
None (cut)
10

TROUBLESHOOTING

SUZ-KA25VA5.TH
SUZ-KA25VA5.TH-ET
SUZ-KA60VA5.TH
SUZ-KA60VA5.TH-ET
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following items:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
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 of 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) Check if the OPERATION INDICATOR lamp on the outdoor P.C. board is blinking on and off to indicate an abnormal-
ity. 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 "10-2. TROUBLESHOOTING CHECK TABLE" and "10-3. HOW TO PROCEED "SELF-
DIAGNOSIS"".
OCH603
SUZ-KA35VA5.TH
SUZ-KA35VA5.TH-ET
SUZ-KA71VA5.TH
SUZ-KA71VA5.TH-ET
SUZ-KA25VA5 SUZ-KA35VA5
5
8
SUZ-KA35VA5.TH
SUZ-KA35VA5.TH-ET
SUZ-KA71VA5.TH
SUZ-KA71VA5.TH-ET
Lead wire
17
SUZ-KA50VA5.TH
SUZ-KA50VA5.TH-ET
Defrost finish temperature (°C)
SUZ-KA50VA5
9
13 18
SUZ-KA50VA5.TH
SUZ-KA50VA5.TH-ET
Housing point
SUZ-KA60VA5
SUZ-KA71VA5
9 10
18