Kenmore Elite Electric Dryer Smartheat QuietPak9 HE4 Model 110.85088400. Symptoms: Intermittent symptoms; Some buttons in the control panel don't do anything when pressed, Time Dry, Express Dry. Other buttons light up when pressed Normal, Casual, Touch Up but Start button will not start the machine. No beep or click sound when pressed. Diagnose Mode doesn't come up when pressing 'More Time' + less time buttons multiple times. Then suddenly after some time, everything works. Diagnose mode comes up and no errors show up. After using the dryer it seems that the next day doesn't work again. I checked these: Belt is ok. Thermal fuse ok. Thermistor ok. Disconnected dryer for periods of time to reset control panel. When nothing works only after some time everything suddenly works.
Question edited for clarity.
Intermittent problems are the most difficult faults to diagnose because of their nature. Everything you state leads me to believe it is a button problem, or a main board problem, but the fact it works perfectly sometimes mean it is not the electronics board itself. They tend to work, or they don't, so it is likely a connection problem, due to heat, cold and vibration. Get a can of Electrical Switch Cleaner, (not WD40). Remove the panel and flood the buttons with switch cleaner. I see there are 4 multipin connectors on the wiring harness. break these connections and spray the with cleaner. Make and break a couple of times to clean the contacts. Take pictures before removing the connectors as two look similar.
Unfortunately, the control board is no longer available in any of the colours at Sears, so I hope this cleaning works for you. Another thing you can check for is a board track crack or a dry joint. Use a jewelers loupe to magnify.
https://www.searspartsdirect.com/model/5cf25nkh29-000583/kenmore-elite-11085088400-dryer-parts
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