System always heating whether CH and HW on or off
I've tried replacing the old CH & HW controller in my system with a Tado wireless receiver and wireless temperature sensor. The problem I have is that whenever the power to the system is on, the bolier runs regardless of whether the wireless temperature sensor or scheduled switching or manual overrides via the app are calling for heating and/or hot water or not. All the LEDs on the wireless receiver light or not when I would expect, so that part of system control seesm to be working.
Boiler is an old Ideal WLx RS50:
Old Honeywell ST7100 CH & HW contoller wiring:
Tado wireless receiver wiring:
Tado devices as listed on website (wireless receiver not connected as power was off):
I must have made a mistake somewhere but I can't see it. Any ideas?