Troubleshooting

Dust particles,bacteria, dirt,and smoke floating in the air are drawn into the air conditioner's indoor unit filter when cooling. Submicron dust particles pass through the filter and adhere to the evaporator.
During cooling operation, condensation forms on the evaporator. Post-shutdown in summer ambient conditions, this residual moisture facilitates microbial growth , resulting in musty odor emission upon subsequent system restart.

Recommendations:

1. Clean the filter regularly.
2. Before turning off the air conditioner, set it to fan mode and let the indoor unit run for 3-5 minutes or more to dry the moisture on the evaporator. This will significantly reduce odor formation.