Tado wired thermostat not communicating with my boiler
I have a Worcester Bosch Greenstar 37 CDi combi boiler.
My installer has just connected a Tado Wired Thermostat Starter Kit V3+. ALl of the wifi pairing is fine, and it's communicating with the app and the Smart Radiator Thermostats fine. The only (critical) problem is that the Wired Thermostat isn't communicating with the boiler - either to turn it on or off. The installer has tested the electrics and found them fine without the Tado (plus my previous thermostat worked fine), but he says only 160v are being passed to the boiler by the Tado Wired Thermostat, so he's not surprised that it isn't able to power the boiler up or down.
I see there are quite a lot of posts on here about Wired Tado Thermostats not communicating with boilers, and the only helpful sign was someone saying that Tado had pushed a change to the configuration.
Other than it being very disappointing and having wasted a lot of time, it's not a massive problem at the moment that I have no heating as teh weather is warm. However, we do need to get this working after investing =nearly £400 in the Tado system.
All advice welcome.