hi all. fitted a WB30CDI a couple of years ago. customer has very recently come back to me saying the rf stat wont work properly, basically the signal is not strong or something like that, he has changed the batteries as i thought they were just wearing low, this hasnt helped, the only way he can get the stat to communicate with the boiler is to put it within 3ft of the boiler which is located in the middle of the upstairs landing (in the old airing cupboard). i was just wondering if this is a set up issue or if there is a known problem with the dt10rf stats?