Do you have ice? If so, filter is probably working, also, ours gives us a message when the filter needs to be changed. On ours there is a connection from the light switch to the ICE and water dispenser, so these are blocked from operating if either door is open. I recall seeing reports where the lights were not going off, and this stopped ice and water dispensers from working.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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