Tado thinks radiators are on, but none are heating up/does not turn on boiler
We have Tado valves on all the radiators, and an extension kit to control water and boiler, plus a thermostat.
Tado thinks the heating is all on. However, it has failed to turn on the boiler. None of the radiators are warm - despite Tado thinking they are "on". We can hear a change (the valves changing), just here is no heat.
We have tried reboot the extension. However, it is just sitting there flashing (showing connected).
Anyone any ideas or do we need to just junk the whole (now very expensive) setup?
[This WAS all working, but has now seemed to fail.]