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TROUBLESHOOTING
In-tracking Error
Error between AHU KIT and outdoor unit at the beginning of operation(in tracking)
Outdoor unit display
Explanation
Communication error between AHU KIT and the outdoor unit
Reason
Refer to following self check
1) Self check
Check the number of AHU KIT set
up on outdoor unit PBA is equal to actual
number of AHU KIT installed.
Do numbers match?
Press the reset key(K3) on the outdoor unit
PBA and check the responding numbers of
AHU KIT on the display.
Is there no response on the
display in-tracking?
Disconnect the two communication cable
from outdoor unit to AHU KIT and check the
both cables with oscilloscope.
Are the voltage between the
cables verified as square wave
over DC±0.7?
- Check the communication cables between
the AHU KIT and outdoor/indoor units.
- When there is no error, connect just one
AHU KIT to check them individually.
- When the error still occurs, change the
AHU KIT PBA
(Continued)
Yes
Yes
Yes
Yes
No
Set the correct number of AHU KIT on
outdoor unit PBA and press the reset
key(K3) to restart the tracking.
No
Wait for 2 minutes and find the AHU KIT with the
communication error. Check if the address on PBA is
same with any others.
- Communication error occurs when the address is
assigned to more than one AHU KIT. In this case, all the
AHU KIT sharing one address will show error message.
If the address is correct, check the
communication cable and
change the AHU KIT PBA
No
Check the communication cable and
the connector on outdoor unit and
change the PBA.
• Wired remote controller will show the same
Note
error shown in the outdoor unit.
27
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