Panasonic U-4LE1E5 Service Manual page 96

3. Mini VRF System Alarm Codes
E07 Error in Outdoor Unit Transmitting Signal to the Indoor Unit
1. Error Detection Method
It is judged an error when a unit itself cannot receive (discrepancy) a signal within a 3-minute period that it had sent.
• Outdoor main PC board error
•
The setting of the terminal resistor select switch on the outdoor main PC board is set incorrectly.
2. Error Diagnosis
1 Outdoor
1-1
unit
control
PC board
1-2
1-3
1-4
1-5
• For information on the procedures for replacing the outdoor main PC board, refer to the manual that is packaged with the
service board.
(for single-phase outdoor unit PC board)
5
Is the indoor/outdoor operation line connected to more than one
outdoor unit? (Network wired?)
Is the SHORT on the terminal resistor switch on the outdoor main
PC board set to one unit, and the others are OPEN?
Is the terminal resistor select switch on the outdoor main PC board
set to OPEN?
Is the indoor/outdoor operation line opened or shorted?
Replace the outdoor unit main PC board.
TERMINAL
(for 3-phase outdoor unit PC board)
TERMINAL
5 - 16
Mini VRF SYSTEM
Trouble Diagnosis
Yes 1-2
No 1-3
Yes 1-4
Set the SHORT to
No
one unit only
Make the SHORT
Yes
setting
No 1-4
Yes Correct the wiring
No 1-5