Error 88 — Inverter Temp Lockout

What does 88 mean?

The system has entered a lockout state because the inverter temperature limits were exceeded multiple times (Error 75). This can be due to blocked heat exchangers, low airflow, or operation outside normal ranges.

• Blocked Inverter Heat Exchanger (fins)
• Outdoor Airflow too low or off
• Outside Normal Operating Range (e.g., outside cooling ambient temperature range)
• Inverter internal damage

Click steps to track your progress.

1. 1

   Check the inverter fins for any debris and clean them if necessary.

2. 2

   Inspect the condenser (IDU in heating, ODU in cooling) for clogging (ice or debris) and clean it. Ensure the condenser fan motor is working.

3. 3

   If the problem persists, contact a qualified technician, as the inverter may have internal damage and require replacement.