Www.iqair.com. This website may get you in contact with someone who can replace your HEPA filter system with something else. A company that specializes in indoor air quality Was informed that the air conditioner wasn’t working last night. This morning they reset the breakers and everything started working after that. Started and stop the system several times couldn’t reproduce the issue. Went ahead and checked refrigerant charge temperature differences marked when the uv bulb was replaced. Had cleaned the ectrostatic filter on last service. Couldn’t find a reason for system not to switch over.