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2-WAY MULTISET VRF SYSTEM
Self-Diagnostics Function Table
5
Self-Diagnostics Function Table
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Causes and corrections in instances when automatic address setting cannot be started
•
Causes and corrections in instances when automatic address setting starts, but cannot be completed successfully
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If alarm E15, E16, or E20 appears after automatic address setting is started, check the following items.
Trouble
Cause and correction
Trouble
Cause and correction
The power LED (D53) 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.
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.
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
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).
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.
Alarm display
E15
E16
E20
Alarm description
The number of indoor units detected during automatic address setting was smaller than the
number of indoor units which was set with switch S004 and S005 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 and S005 on the outdoor unit PCB.
The outdoor unit received no serial signals from indoor units within 90 seconds after automatic
address setting was started.
1. Self-Diagnostics Function Table
