Mitsubishi Electric SUZ-KA25VA Technical & Service Manual page 67

Check of LEV (Expansion valve)
L
Start
Turn on power supply to the outdoor unit after checking LEV coil is mounted to
the LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
No
Disconnect the connector
CN724 is there normal resistance to LEV coil?
No
Replace the LEV coil.
Outdoor base gets frozen.
Check of defrost heater
M
Check the following points before checking electric continuity.
1) Does the resistance of ambient temperature thermistor have the characteristics? Refer to 12-6-1.
2) Is the resistance of defrost heater normal? Refer to 12-4.
3) Does the heater protector remain conducted (not open)?
4) Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors?
In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 5: or less, and let the
defrost thermistor continue to read -1: or less.
Is there 230V AC between CN722 1 and 3 on the
power P.C. board? Refer to 12-6-2.
Is the voltage between CN726 2(+)-3(-) on the
power P.C. board 0V DC? Refer to 12-6-2.
Replace the inverter P.C. board.
[SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH]
(For wired remote controller use model)
Yes
Normal
Yes
Replace the inverter P.C. board.
<SUZ-KA25VAH SUZ-KA35VAH>
NOTE: In case both thermistors are more than the above
temperature, cool them with cold water etc...
Yes
No
Yes
No
67
2
No problem of the
power P.C. board.
Replace the power
P.C. board.
3
230V AC
CN726
3
2
1
CN722
26H
H