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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 back-up 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?
Is the total capacity of
14
connected indoor units within
Check inverter PC board.
( *1) Set-up "no detection" of over capacity.
Turn on SW09 bit 2 on interface PC board of outdoor unit (usually OFF).
( *2) Check No. of connected indoor units.
Set SW01/SW02/SW03 on interface PC board of outdoor unit to 1/4/3, respectively.
No. of connected units is displayed on the 7 segment display.
Troubleshooting
Diagnostic procedure for check code
No
Yes
No
Yes
No
Yes
No
135%?
Yes
Operation cause
Missing phase of outdoor unit power source
Operation cause
1. No. of connected indoor units/connected over
capacity
2. Incorrect set-up of indoor unit HP.
Indoor unit over capacity was detected
during outdoor unit system set-up. Set-
up "no detection" of over capacity (*1).
Confirm system specification.
Keep capacity of connected indoor units
88
Correct HP setting.
within 135%.
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