Toshiba MM-A0280HT Service Manual page 66

Diagnostic Procedure for Check Code
Check code
[87]
Missing phase
A Phase of the outdoor unit power source is missing.
Modify the power source wiring.
Check code
[89]
Indoor over capacity
Is the system backup of the
outdoor unit being completed?
Yes
Is the No.of connected
indoor units acceptable?(*2)
Yes
Is the HP setting correct for each
individual indoor unit?
Yes
Is the total capacity of connected
indoor units within 135%?
Yes
Check inverter P .C. board.
( *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.
Troubleshooting
Missing phase of outdoor unit power source
1. No. of connected indoor units/connected over
capacity.
2. Incorrect setup of indoor unit HP .
No
No
No
No
67 67
Operation cause
Operation cause
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%.
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