Hello pool folks!
My problem: Intermatic timer, T100 series, has stopped working. I tried to replace it with a digital timer, GE 15132, but this did not work either.

Strange symptom is: when I try to use manual override to start the filter, it does not go on. However, when the manual override is in OFF position, I can hear buzzing sounds from Jandy valve hooked up to time. Pool filter still won't go on, but I get power reading from multimeter in the OFF position.

To say I am baffled is an understatement. I was hoping that someone out there will have a "I have seen that! It's (answer)!"

I thought maybe it's the breaker (non-fuse).

Before I call an electrician in, thought I'd put it out there.

Many thanks for reading this. Great info here!