Multiple ceiling fan failure

I have 3 Hampton Bay ceiling fans, all different models, all in different rooms, all on different power circuits. Last night all 3 stopped responding to their respective controllers. Changed all batteries, flipped switches to change which controller ran which fan, powered on/ off. No response. On one the fan and light were on, and unless turned off at the wall switch they remain on. One had fan on only and it's still running. Other was not on at all and won't respond. Almost like interference, but have installed nothing new, changed nothing electrical. We live on a cul-de-sac with lots of neighbors but have no idea how to isolate. Could all three receivers have been blown somehow? Any suggestions appreciated.

 

That is a very strange problem and unfortunately not much comes to mind.
Actually.... lightning strike but you'd probably be aware of that.
I've never seen three receivers fail at the same time.

 

Is it possible somebody turned them off using the pull chain?

It might be odd that they are on different circuits if the rooms are next to each other. Make sure there are no breakers tripped.

The only thing to do next is to remove the fan to access the wiring and test if you have power at the ceiling box.

 

One fan was working and wouldn't shut off. That had power.

 

Were any LED lights added or replaced just prior to the fan problems? Their power supplies can be be electrically noisy and cause RF interference.

 

Can you check the battery voltage under load with a DC voltmeter?