Hitachi RAC-25FPA, Service Manual

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10. Timer lamp blinking: blinking 12 times
[Situation] The timer blinks 12 times and the product will not run.
[Estimated failure locations] ・ Erroneous connection in the indoor-outdoor connection line (F cable)
・
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
[Cautions] ・ When lines A and B 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.
・
Detecting this failure mode turns off the power relay 3 minutes later and blocks the power
supply to the outdoor unit.
[Diagnosis flow]
Initiating troubleshooting
Is the F cable connection free from errors?
Yes
Yes
Yes
Yes
No
No
No
No
Correct the F cable connection.
Is the CN30 securely inserted into
the outdoor board?
Correct the connector.
Press the START/STOP button on the remote control
unit and start the product.
Are terminals A and B of the terminal board of the
electrical parts of the outdoor unit subjected to
220-230V AC?
※ Take measurements within 3 minutes after remote
control operation.
Check the electrical parts of the
outdoor unit.
Are terminals A and B of the terminal board of the electrical
parts of the indoor unit subjected to 220-230V AC?
※
Take measurements within 3 minutes after remote control
operation.
Double-check the F cable for erroneous connection,
wire break and poor insertion, and correct the
nonconforming parts.
Replace the "indoor control P.W.B".
1 . Timer lamp blinking: blinking 13 times
[Situation] The timer lamp blinks 13 times and the product will not run.
[Estimated failure location] ・ EEPROM, microcomputer
[Diagnosis flow]
Replace the "indoor control P.W.B".
1
・
・
Power realy open
Forget to connect CN30 of outdoor P.W.B
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