Panasonic U-4LE1E5 Service Manual page 86

3. Mini VRF System Alarm Codes
Checks Prior to Auto Address Setting
If an outdoor unit displays an alarm, conduct this process after diagnosing the problem.
1 Auto
Address
1-1
2 Indoor/
2-1
outdoor
control line
2-2
2-3
3 Installation
or setting 3-1
related
3-2
3-3
3-4
3-5
3-6
5
Is the power of the indoor unit(s) and outdoor unit(s) on?
Has the wiring of the indoor/outdoor control line been completed?
Is it all connected?
Has high voltage (over AC200V) been applied to the control line
circuit? Has the fuse on the control PC board blown?
(Check each board of the indoor unit(s) and outdoor unit(s).)
The power line and indoor/outdoor control line are miswired. Turn off the power, check &
correct the miswiring and then make connections of the indoor/outdoor control lines to the
emergency side of all the control PC boards and controllers.
Check the setting of the number of indoor units on the outdoor control
PC board. Is the setting the same as the number of indoor units that
are actually connected?
Is the indoor/outdoor control line connected to more than one
outdoor unit? (Network wired?)
Is the Terminal resistor select switch on the outdoor control PC board
set to just one unit?
Are other outdoor units using a duplicate setting?
When units are networked, first set the system address for each outdoor unit in the order
1-2-3 and then run auto address setting.
Run the auto address setting.
5 - 6
Mini VRF SYSTEM
Trouble Diagnosis
Yes 2-1
No Power on
Yes 2-2
No Connect the wiring
Yes 2-3
No 3-1
Yes 3-2
No Correct the setting
Yes 3-3
No 3-6
Yes 3-4
No Correct the setting
Yes 3-5
No 3-6