Climate is humid and hot right now (90s). Inside we have the EMI system with a Lennox condensing unit outside. The indoor wall unit is making a very loud buzzing noise sporadically. The noise lasts for approximately 1 seconds, and occurs every 5 to 30 seconds. It sounds almost like a valve opening and closing very quickly, but we can't figure out for the life of us what it is. Any help is greatly appreciated.
Best we can tell, it is this unit: http://www.emiretroaire.com/products/ductless-split-systems/fixed-capacity-high-wall-split-system-air-handlers
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