If a previously functioning 110V system stops powering on, possibly due to a power outage, lightning strike, or surge, the issue might be with the outdoor control board, which could be blocking power to the inverter board.
- Check Voltage:
Use a multimeter to measure between L and G.- If the reading is 110V, the outdoor control board is likely faulty and needs replacement.
- If the reading is 0V, there’s an issue with the incoming power supply. It’s recommended to have a qualified electrician inspect it, as a surge might have caused other damage.
*Please note these procedures must be performed by a certified HVAC contractor.
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