Heating is on with hot water

Options
PeteS
PeteS
Hi there,
I have my vaillant gas boiler repaired yesterday, and after that I found the heating system is on/off with the hot water, even the heating is turned off.
The gas boiler is seems working fine so the engineer ask me to investigate the control system. The tado control was working well before the boiler repair.
What can I do to sort the problem? I have tried to reset the system by turning the power on/off but it does not work.
Thanks.
Pete