Hitachi RAC-18WPD, Service Manual

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Does the transflux fan rotate gently?
(Be sure to turn off the power before checking it.)
Run the product with the remote control unit set to
"cooling, strong wind".
Has the indoor fan motor run for several seconds?
While the fan was turning, did an about 7.5V voltage
occur between pins
ĺ
and
Ľ
of the fan motor
connector (CN2)?
(These signals should normally occur only while the
fan is rotating.)
Does an about 15 V voltage occur between pins
ĺ
10. Timer lamp blinking: blinking 10 times
[Situation] The timer lamp blinks 10 times and the product will not run.
[Estimated failure locations]
·
Loose connector or wire break in the indoor fan motor
・
・
Indoor fan motor mechanically locked
・
Indoor fan motor
・
Indoor fan motor drive circuit
[Diagnosis flow]
Initiating troubleshooting
No
No
No
No
No
No
No
Yes
Yes
Yes
Remove the cause of the mechanical lock.
Is the indoor fan motor connector (CN2) securely
inserted? Is it free of wire breaks?
Correct the connector and wiring.
For 2 to 3 seconds after startup by remote control,
did a voltage of about 3-6 V occur between pins
ĺ
and
ļ
of the fan motor connector (CN2)?
Replace the "indoor electrical parts". Replace the "indoor fan motor". Replace the "indoor electrical parts".
Is there a factor that mechanically hampers the rotation?
·
The transflux fan is hitting and rubbing against something.
·
There are deposits of viscous dust.
Replace the "indoor fan motor".
and 5 of the fan motor connector (CN2)?
Yes
Yes
Yes
Yes
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