Hitachi RAC-18SX8 Service Manual page 225

13. Timer lamp blinking: blinking 10 times
[Situation] The timer lamp blinks 10 times and the product will not run.
[Estimated failure locations]
[Diagnosis flow]
Initiating troubleshooting
Does the transflux fan rotate gently?
(Be sure to turn off the power before checking it.)
Is the indoor fan motor connector (CN2) securely
inserted? Is it free of wire breaks?
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 FG pulse signal
occur between pins ④ and ⑦ of the fan motor
connector (CN2)?
(These signals should normally occur only while the
fan is rotating.)
Yes
Replace the "indoor electrical installation."
・Loose connector or wire break in the indoor fan motor
・Indoor fan motor mechanically locked
・Indoor fan motor
・Indoor fan motor drive circuit
Yes
Replace the "indoor fan motor."
Yes
Yes
No
Replace the "indoor fan motor."
No
Is there a factor that mechanically hampers the rotation?
・The transflux fan is hitting and rubbing against something.
・There are deposits of viscous dust.
No
Remove the cause of the mechanical lock.
No
Correct the connector and wiring.
No
For 2 to 3 seconds after startup by remote control,
did a voltage of about 3-6 V occur between pins ④
and ⑥ of the fan motor connector (CN2)?
Does a 15 V voltage occur between pins ④ and ⑤ of
the fan motor connector (CN2)?
Yes
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Yes
Yes
No
Replace the "indoor electrical installation."
No