Service manual

73
14
Troubleshooting
Diagnostic Procedure for Check Code
73
Is the system backup of the
outdoor unit being completed?
Is the No.of connected
indoor units acceptable?(*2)
Is the HP setting correct for each
individual indoor unit?
No
Yes
No
Yes
No
Yes
No
Yes
Indoor unit over capacity was
detected during outdoor unit system
setup. Setup “no detection” of over
capacity (*1).
Confirm system specification.
Correct HP setting.
Keep capacity of connected indoor
units within 135%.
Is the total capacity of connected
indoor units within 135%?
Check inverter P.C. board.
Check code Operation cause
[89]
1. No. of connected indoor units/connected over
Indoor over capacity
capacity.
2. Incorrect setup of indoor unit HP.
Check code Operation cause
[87]
Missing phase of outdoor unit power source
Missing phase
A Phase of the outdoor unit power source is missing.
Modify the power source wiring.
( *1) Setup “no detection” of over capacity.
Turn on SW09 bit 2 on interface P.C. board of outdoor unit (usually OFF).
( *2) Check No. of connected indoor units.
Set SW01/SW02/SW03 on interface P.C. board of outdoor unit to 1/4/3, respectively.
No. of connected units is displayed on the 7 segment display.