Panasonic U-4LE1E5 Service Manual page 48

1. Self-Diagnostics Function Table
Self-Diagnostics Function Table
• Causes and corrections in instances when automatic address setting cannot be started.
The power LED 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 remote controller.
Nothing happens when the operator attempts to start
automatic address setting from the remote controller.
• Causes and corrections in instances when automatic address setting starts, but cannot be completed successfully.
An alarm appears on the 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 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).
• If alarm E15, E16, or E20 appears after automatic address setting is started, check the following items.
Alarm display
E15
5
E16
E20
Trouble
Trouble
The number of indoor units detected during automatic address setting was smaller than the
number of indoor units which was set with switch S004 on the outdoor unit PCB.
The number of indoor units detected during automatic address setting was larger than the
number of indoor units which was set with switch S004 on the outdoor unit PCB.
The outdoor unit received no serial signals from indoor units within 90 seconds after
automatic address setting was started.
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 Displays" table and correct the
problem.
Check that the 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 Displays" table and correct the
problem.
Check the alarm details on the "Outdoor Unit Control
PCB LED 1 and 2 Alarms" table, then check the "Alarm
Displays" table and correct the problem.
Alarm description
5-2
Mini VRF SYSTEM