Hitachi RAC-18SX8 Service Manual page 211

5. Failure phenomenon: The clean lamp is blinking (on for 4 seconds, off for 1 second).
[Situation] The clean lamp is blinking (on for 4 seconds, off for 1 second).
The cleaner is not operating.
The self-diagnosis memory stores "timer lamp blinked 18 times."
[Estimated failure locations]
[Cautions]
[ Diagnosis flow]
Initiating troubleshooting
Has the cleaner become mechanically locked?
Is the connector CN8 or CN10 loose or is there any lead
wire break?
Is the cleaner drive circuit normal?
※For details, see page 176.
Is the cleaner drive motor (shaft) running?
When the cleaner is moving rightwards, press the
cleaning location detection switch. Will the cleaner then
stop?
Replace the "cleaner."
・Mechanical lock of the cleaner
・The connectors CN8 and CN10 loose, lead wire break
・Cleaner drive motor out of order
・Cleaner location detection switch out of order
・Cleaner drive circuit
To perform self-diagnosis (failure detection) on the cleaner, turn off the power, ensure that the
power relay has become turned off, turn the power back on, and catch the timing at which
initialization starts.
No
No
Yes
Yes
Yes
Yes
Yes
No
Replace the "indoor electrical installation."
No
Replace the "cleaner drive motor."
No
Replace the "cleaner location detection switch."
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Correct the locked part.
Correct the connectors.