Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 340

Resolución de averías
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:
defrost thermistor continue to read -1
Is there 230V AC between CN722 1 and
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.
340
[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>
°C
or less.
NOTE: In case both thermistors are more than the above
temperature, cool them with cold water etc...
on the
No
No
Yes
No problem of the
power P.C. board.
Yes
Replace the power
P.C. board.
or less, and let the
2 3
230V AC
CN726
3
2
1
CN722
26H
H