Rads taking minimum 40 mins to start heating even tho app shows them as "heating"

I have multiple TRV's on the rads, some which are taking minimum 40 mins to even start heating up in spite of being scheduled to do so. App also says that they're heating when they aren't

Also - getting numerous "open window" messages on a particular rad - even though no window anywhere open. Getting these messages even when the heating is not scheduled to be on.

Any thoughts?

Thanks

Answers