Panasonic U-4LE1R8 Service Manual page 64

3. Mini VRF System Alarm Codes
E30 Outdoor Unit Serial Transmission Error
1. Error Detection Method
Outdoor unit unable to read and confirm its own transmission data with the board of the outdoor unit.
• The power to the control PC board of the outdoor unit is not turned on.
•
The circuit on the control PC board of the outdoor unit faulty.
2. Error Diagnosis
1 Power,
wiring
1-1
1-2
3
Is the power to the control PC board of the outdoor unit on?
Check the LED.
Replace the control PC board of the outdoor unit.
(Transmission from an outdoor unit faulty.)
3-24
Mini VRF SYSTEM
Trouble Diagnosis
1-2 (Turn the power
Yes
back on)
No Power on