We have Mitsubishi mini split. 2 wall units, one ceiling unit. Tuesday we had power outage mid night. Not the first one. Yet, thereafter, MHK1 ceiling unit controller does not connect to receiver. Both wall mount units work fine. Their controllers, hand held, also work fine. Hence, system works fine. Except the ceiling unit. Steps taken so far: 1. complete power down and res tart of the entire system from main panel. 2. multiple resets done from WIFI receiver. 3. receiver has power to it, at least, power light is on. 4. pressing reset button results in connection button blinking but, that's it. 5. MHK1 has blank display, with only no signal blinking and wait messages. If any button is pressed, display lights up. That's it. Display DOES NOT show anything else, no temperature, no "connect" or else. Blank and only those 2 messages 6. batteries changed in MHK1. No result. MHK! is not wired, it is remote wifi control via receiver only. Hence, power outage, theoretically, should not affected it. If you look at this video: [url]https://www.youtube.com/watch?v=IZSqGCVLskQ[/url] you will notice that, outta da box, display actually shows some data on it and shows Connect command. In our case, it is blank and pressing buttons does not produce and results. New kit is $250 ebay. But, before I fork for it, as heat wave is around the corner, is there anything else I can do? I don't really want to call in installer, pay him $100 just for him to tell me "you need new kit". As, from what I see, receiver is bad as, it is the only piece of electronics in the kit that was, actually, wire powered. How could power outage influence battery powered t-stat, is beyond me. Don't waste time Googling this, I did it for 4 last days. No help.

I have a new townhouse that I will barely need to use central air (I never had central AC before). Having a strong interest in the environment and it's not often I get hot, I will barely be using the AC. I am looking for guidelines on how long I should run it for when I use it and; do I need to run it every x amount of days or weeks? I ask these questions to prevent any problems. Maybe a dishwasher is the only appliance "use it or lose it"