Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 342

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How to check mis-wiring and serial signal error (when outdoor unit does not work)
O
(For wired remote controller use model)
As for indoor unit.
Inverter P.C.board
(Parts side)
LED
Blinking
A
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON it again.
· Press EMERGENCY OPERATION
switch.
Is serial signal
No
error indicated
6 minutes later?
Yes
B
342
[SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH]
Turn OFF the power supply.
Is there rated voltage in
the power supply?
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Press EMERGENCY OPERATION switch once.
Does the lamp of OPERATION INDICATOR
lamp light up?
<Confirmation of the power to the indoor unit>
Is serial signal error indicated 6 minutes later?
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not mis-wiring.
B
Short-circuit outdoor terminal block S2 and
S3.
W1
Turn ON the power supply.
Does the LED on the inverter P.C. board
or the outdoor electronic control P.C.board
repeat "3.6-second-OFF and 0.8-second-
quick blinking"?
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20V DC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
· Reinstall
either the
unit or the
light each
other away.
· Attach a filter
on receiving
Replace the indoor electronic control P.C. board.
section of
Be sure to release the failure-mode
the indoor
recall function after checking.
unit.
No
Check the power
supply.
Yes
No
Check the wiring.
Yes
No
Yes
No
Yes
A
W1. Mis-wiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.
W3.Be sure to check this within 3 minutes after turning
ON. After 3 minutes, LED blinks 6 times. Even when
the inverter P.C.board or the outdoor electronic control
P.C.board is normal, LED blinks 6 times after 3 minutes.
No
(Lighted
W3
or not
lighted)
Yes
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
No
contact to the terminal block?
Yes
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
No
Yes
Is there any mis-wiring,
poor contact, or wire
Yes
disconnection of the Make them correct.
indoor/outdoor
connecting wire?
No
Replace the inverter P.C. board
or the outdoor electronic control
P.C.board. W2
W2 Be careful to the residual
voltage of smoothing capacitor.
Replace the
Yes
indoor/outdoor
connecting wire.
No
Replace the
Yes
indoor/outdoor
connecting wire.
No