Thanks for the followup @RandomGrinch, I decided to temporarily re-connect the ESI thermostats in place of the Tado units. I'm waiting to see if I can catch the boiler starting up with a call for heat when it shouldn't.
Before I did re-connect the ESI thermostats I decided to take apart the...
Hi @Chigurh - how has your system been performing with this new thermostat? Any random fires of the boiler?
@RandomGrinch thank you very much for your extensive advice on this thread. I also mustered up the courage to swap out my ESI thermostats (same models and wiring centre as OP) for Tado...