Panasonic U-8ME1E81 Service Manual page 92

1. Self-Diagnostics Function Table
Self-Diagnostics Function Table
Causes and corrections in instances when automatic address setting cannot be started
•
The power LED (LED4) on the outdoor unit control PCB does not turn ON.
LED 1 and 2 on the outdoor unit control PCB do not turn OFF when the
outdoor unit power is turned ON, and automatic address setting cannot
be started.
An alarm appears immediately when automatic address setting is started
from the wired remote controller.
Nothing happens when the operator attempts to start automatic address
setting from the wired remote controller.
1
Causes and corrections in instances when automatic address setting starts, but cannot be completed successfully
•
An alarm appears on the wired remote controller sometime from several
seconds to several minutes after automatic address setting is started.
LED 1 and 2 on the outdoor unit control PCB indicate that automatic
2
address setting is in progress (the LEDs blink alternately) for several
minutes after automatic address setting is started (the compressors may
also start and stop several times), however LED 1 and 2 never indicate
that automatic address setting is completed (turn OFF).
3
If alarm E15, E16, or E20 appears after automatic address setting is started, check the following items.
•
Alarm display
The number of indoor units detected during automatic address setting was smaller than the number of
E15
indoor units which was set with switch SW3 and SW4 on the outdoor unit PCB.
4
The number of indoor units detected during automatic address setting was larger than the number of indoor
E16
units which was set with switch SW3 and SW4 on the outdoor unit PCB.
The outdoor unit received no serial signals from indoor units within 90 seconds after automatic address
E20
setting was started.
5
6
7
8
Trouble
Trouble
Alarm description
5-2
Self-Diagnostics Function Table
Cause and correction
Check for any errors in the power wiring to
the outdoor unit, and check for a missing
phase.
Check the "Alarm Display" table and
correct the problem.
(See page 3-2 to 3-4.)
Check that the wired remote controller wiring
and the inter-unit control wiring are connected
correctly.
Check that the indoor unit power is ON.
Cause and correction
Check the "Alarm Display" table and
correct the problem. (See page 3-2 to 3-4.)
Check the alarm details on the "Outdoor
Unit Control PCB LED 1 and 2 Alarms" ,
then correct the problem.
2WAY SYSTEM