New Anova sounds constant alarm when switched on but won’t work?
Won’t accept App or work on manual but alarm is going off.
Ramondavich.
Only thing to do is contact Support.
And they told me to ask the question here 
You’re kidding. We’re only end users like you.
OK. You might try resetting the device. Should be instructions in the troubleshooting section of support FAQs. Here
Can’t help with the app as I don’t use it.