Today plumber installed unvented hot water cylinder to replace old hot water tank and converted gravity fed boiler to sealed system. Now my Tado smart thermostat not working. Heating and water on all time. Contacted Tado and they told me at 2.30 today thermostat stopped communicating with boiler and wiring issue. Only way to stop it is switch boiler off. Trying to get plumber back. But what have they done? As far as I know they didn't touch boiler or thermostat.