Top off pump made some noises (it does when it comes on, it's a Aquamedic 3000 pump...), so my grandma who was visiting for the weekend, thought that something was wrong with the tank. She ended up cutting power to everything, except the lights and vortec (she didn't know how to fiddle w/the timer and the vortec backup). Temp spiked during the weekend since the chiller wasn't powered while the lights were on...