Sanyo DHX3652, UHX2452, UHX0752 Self-Diagnosis Function Table, Trouble Cause and correction

1

Self-Diagnosis Function Table

1. Self-Diagnosis Function Table

1. Self-Diagnosis Function Table

•Causes and corrections in instances when automatic address setting cannot be started

Trouble Cause and correction

The power LED (D53) on the outdoor unit control PCB does not turn ON. Check for any errors in the power wiring to the outdoor unit, and check for a missing phase.

LED 1 and 2 on the outdoor unit control PCB do not turn OFF when	Check the “Alarm Display” table and
the outdoor unit power is turned ON, and automatic address setting	correct the problem.
cannot be started.	(Refer to Section 3 Trouble Diagnosis)
An alarm appears immediately when automatic address setting is
started from the wired remote controller.
Nothing happens when the operator attempts to start automatic	Check that the wired remote controller
address setting from the wired remote controller.	wiring and the inter-unit control wiring are
	connected correctly.
	Check that the indoor unit power is ON.

•Causes and corrections in instances when automatic address setting starts, but cannot be completed successfully

Trouble Cause and correction

2

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.

(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.

3

4

5

6

7

8

•If alarm E15, E16, or E20 appears after automatic address setting is started, check the following items.

Alarm displayAlarm description

E15	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.
E16	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.
E20	The outdoor unit received no serial signals from indoor units within 90 seconds after automatic
	address setting was started.

5-2