My unit would display e001 and e003 errors. Cleaning the filter and replacing the ceramic ozone plate did not fix it. Ended up taking the board out and inspecting it. Three capacitors were bad. After replacing, the system is working again.
Most times the cover has an interlock. Look for something prijecting from cover and the a place where this would fit into. Align cover then close. If you dont see one then look under or behind filter. Also check the filter is installed correctly (direction of airflow). Remove power (unplug or circut breaker) then power back on might reset as well.
Continuous snapping is not normal .Remove both electronic cells. Make sure that there is no hair, dirt, sand or any debris on the bottom inside the Electronic air cleaner. If there is, remove what you can by hand. If a lot of debris is left in bottom of the Air Cleaner, you may want to use a vacuum attachment to see if you can vacuum up what you can.