Sanyo AHX0752 Service Manual page 100

1. Self-Diagnosis Function Table
1. Self-Diagnosis Function Table
• Causes and corrections in instances when automatic address setting cannot be started
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.
• Causes and corrections in instances when automatic address setting starts, but cannot be completed successfully
1
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
E15
number of indoor units which was set with switch S004 and S005 on the outdoor unit PCB.
4
The number of indoor units detected during automatic address setting was larger than the
E16
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
E20
address setting was started.
5
6
7
8
Trouble
Trouble
Alarm description
5-2
Self-Diagnosis 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.
(Refer to Section 3 Trouble Diagnosis)
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.
(Refer to Section 3 Trouble Diagnosis.)
Check the alarm details on the "Outdoor
Unit Control PCB LED 1 and 2 Alarms" ,
then correct the problem.