Hitachi RAK-18QXB Service Manual page 89

12. Timer lamp blinking: blinking 12 times
[Situation] The timer blinks 12 times and the product will not run.
[Estimated failure locations]
[Cautions] When lines 1 and 2 of F cable are erroneously connected (crossed), the product may not
enter self-diagnosis display mode. If the self-diagnosis memory stores data about "timer
lamp blinked 12 times", then, just in case, check if the F cable is not erroneously connected.
[Diagnosis flow]
Initiating troubleshooting
Is the F cable connection free from errors?
Is the CN 27 securely inserted into
the outdoor board?
Press the START/STOP button on the remote control
unit and start the product.
Are terminals 1 and 2of the terminal board of the
electrical parts of the outdoor unit subjected to
AC 220-230V ?
Take measurements within 3 minutes after remote
control operation.
Are terminals 1 and 2 of the terminal board of the electrical
parts of the indoor unit subjected to
Take measurements within 3 minutes after remote control
operation.
Replace the "indoor control P.W.B".
1 . Timer lamp blinking: blinking 13 times 3
[Situation] The timer lamp blinks 13 times and the product will not run.
[Estimated failure location]
[Diagnosis flow]
Replace the "indoor control P.W.B".
Erroneous connection in the indoor-outdoor connection line (F cable)
Forget to connect CN27 of outdoor P.W.B
Wire break or poor insertion of the indoor-outdoor connection line (F cable)
Electrical parts in the outdoor unit (communication circuit, power circuit error)
Communication error due to noise in other home electronics
This does not constitute a failure in the air-conditioner
Yes
Yes
No
AC 220-230V ?
No
EEPROM, microcomputer
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No
Correct the F cable connection.
No
Correct the connector.
Yes
Check the electrical parts of the
outdoor unit.
Yes
Double-check the F cable for erroneous connection,
wire break and poor insertion, and correct the
nonconforming parts.