I just got back from a few days away. and noticed that my tunze was not on. I switched the unit off and waited for about 30 seconds and switched it back on again. It made a high pitched screeching noise and both lights were lit up, after about 15 seconds it seemed to be working fne, but the pump light was not on and the pump was not working. I would be grateful for any assistrance. BTW. everything except the pump is dry!!