My Anova has hit the set temperature but won’t start the timer. It still shows as Preheating. It’s been this way for an hour. Why?
Unfortunately, the timer has been acting a little funky. There’s a known bug and we are working on getting that fixed. 
The timer function in the app doesn’t really do anything for you anyways - the APC keeps cooking after the timer expires (as a safety feature, so people don’t forget about it and let their cook cool off into the danger zone).
Me, I use my calendar in my phone for timing cooks - has the added benefit of ensuring I don’t plan an evening out when something delicious is going to be ready in my sous vide bath. 