The controller you have taken photos of is a wireless thermostat. It looks like you have a very simple system. A combi boiler with a single wireless (Hive) thermostat which just turns the room temperature up and down.
Was it all fitted by BG? Anyway, just tell them the thermostat is playing up and ask them to replace it. You can book online.
Yep all that was done.
Supposed to be here today but they said nothing was booked which is rubbish as B Gas even put a notice on my Google calendar but they denied it all, they are here tomorrow so another 1/2 day wasted waiting for them.
You said the room is being heated without the control (thermostat) being on. A stuck microswitch can cause a boiler to stay on, irrespective of what is being asked from the thermostat
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