The most likely culprits are that the controller got wet, or something was moved that creates an electromagnetic field and is affecting the controller. I would double check that it did not get wet, water damage is not repairable and the only option will be buying a replacement controller unit 5017. I would also be sure the controller is not closer to a magnet, ballast, wireless controller or LED driver than it was before. If it is neither of these, if you send it in we will repair it under warranty, include the controller, pump, power supply and a note with your return address and phone number.
Tunze USA
305 Victor St
Austin, TX 78753