We have recently installed a valliant ecotec esclusive boiler, digistat +2Rf thermostat and 6 radiators. The room with the thermostat has no TVR but the others do. The system seems to be running ok on the timer controls but we are having problems with the manual override. We press the + button to increase the heat, the flame is on the digistat display but the boiler then says no heat required. The installer says all the other radiators should be on for this to work but what is the point of the TVRs then. We tried it last night with all the radiators apart from the living room off, nothing happened, we then put on 1 radiator at a time and they heated up but not the living room! What are we doing wrong we want heat in the living room but not the bedrooms