[Closed] Central Heating Engineers

Probably a vendor specific thing this but maybe not.

I went to bed early last night. The wife stayed up to watch some telly and being a woman had the heating ramped up to freaking sweltering. I left her with strict instructions to turn the heating back down before coming to bed. We have one of the wireless thermostats mounted on the wall in the living room.

So come 3 in the morning I wake up in bed by myself feeling like I've been moved to India. I appear to have been sprayed with a hose which actually turns out to be sweat because it's about 30 degrees. I go downstairs and sure enough, my wife, one of the cats and the dog are all comotose, sprawled across one of the sofas, no doubt having passed out with the heat.

(here's the actual question)
I check the thermostat and she actually appears to have taken me at my word and turned it down a whole half degree. The house certainly feels hotter than the dial says but I turn it right down anyway. The boiler keeps running at max. I give it a few minutes and nothing changes so I look at the boiler and the blue wireless light isn't flashing. I take the thermostat off the wall, it's still ticking but I change the batteries and immediately the blue light on the boiler starts flashing and it turns itself off.

So if the thermostat wasn't communicating with the boiler, why was the boiler going hell for leather, or does it just remember the last peice of information it was sent which in this case was 'turn on'. Should the boiler not only maintain it's on state if it keeps recieving 'on' signals?