Sanyo AHX0752 Service Manual page 101

1. Self-Diagnosis Function Table
Check that the indoor unit power is turned ON.
Check that the inter-unit control wiring is connected correctly. (Check that there are no open
circuits, short circuits, terminal plugs, incorrect wiring to the remote controller terminals, or
similar problems.)
Check that the remote controller wiring is connected correctly. (Check that there are no open
circuits, short circuits, incorrect wiring to the inter-unit control wiring terminals, group control
crossover wiring, or similar problems.)
Check that the number of indoor units has been set correctly using switch S004 and S005
on the outdoor unit control PCB.
Check that the amount of additional refrigerant charge is correct when performing Auto
Address Setting Case 3A or Case 3B in the flow chart described on page 1-3.
Check that the refrigerant tubing connections are correct when performing Auto Address
Setting Case 3A or Case 3B in the flow chart described on page 1-3.
Check that there are no problems with indoor unit sensors E1 and E3 when performing Auto
Address Setting Case 3A or Case 3B in the flow chart described on page 1-3.
Check that there are no indoor units where the system address was already incorrectly set
by manual or automatic address setting.
• When automatic address setting is started from the outdoor unit control PCB or from the remote controller,
(SETTING) appears on the remote controller at units where the inter-unit control wiring and remote
controller wiring are connected correctly. LED 1 and 2 on the outdoor unit control PCB blink alternately.
• In the case of indoor unit group control, if there is a mistake in the group-control wiring, addresses may not be set
even if (SETTING) appears.
• Even if alarm E15 or E16 appears, addresses are set at those indoor units which could be verified. The set
addresses can be checked using the wired remote controller.
• If one of the below alarms appears when the remote controller is operated after automatic address setting was
completed (LED 1 and 2 on the outdoor unit control PCB are turned OFF), follow the instructions in the table
below and correct the problem location.
Remote controller
display
Nothing is The remote controller is not connected correctly (power trouble).
displayed. The indoor unit power was cut off after automatic address setting was completed.
The remote controller is not connected correctly (remote controller receiving trouble).
E01 The remote controller of an indoor unit where the indoor unit address is not set is inadvertently
operated. (Communications with the outdoor unit are not possible.)
The remote controller is not connected correctly (trouble with sending of the signal from the
E02
remote controller to the indoor unit).
P09 The indoor unit ceiling panel connector is not connected correctly.
Check items
Cause
5-3
Self-Diagnosis Function Table
E15 E16 E20
1
2
3
4
5
6
7
8