Hitachi RAC-18WPB, Service Manual

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[Situation]
The product is giving a display to indicate that it is performing forcible cooling.
(This is not a sign of a breakdown.)
[Estimated failure locations]
·
Meltdown of the terminal board temperature fuse (the terminal board poorly inserted into
the F cable)
·
Outdoor communication circuit out of order
[Cautions]
[Diagnosis flow]
[Situation]
The timer lamp blinks three times and the product will not operate.
· If a terminal board is replaced to counter the meltdown of the terminal board temperature
fuse, ensure that the F cable to be inserted into the terminal board has the appropriate
dimension for peeling the insulation sheathing and that the insertion region is unbent before
inserting it into the terminal board securely.
Detach the connector (CN3) from the terminal board
temperature fuse and check the temperature fuse for
continuity. Is the resistance almost 0
No
Yes
Initiating troubleshooting
Replace the "indoor electrical parts".
Replace the "terminal board".
6. Timer lamp blinking: blinking twice
7. Timer lamp blinking: blinking three times
[Estimated failure locations]
· Outdoor unit error.
· Please confirm the times of the LD301 blinking, and then
Situation
The timer lamp blinks four times and the product will not operate.
see the outdoor selfcheck lable.
[Situation]
(This is not a sign of a breakdown.)
5. Timer lamp blinking: blinking once
The timer lamp blinks one time and the product will not operate.
[Estimated failure locations]
· Reversing valve defective.
·
The refrigerating cycle block gas leak.
8. Timer lamp blinking: blinking four times
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