Boiler control question

[Johntheboy]

Hi,

I've a question on my boiler layout which I've attached photos of.

I turned the wall thermostat I have right down to off last night. However the heating was on when I came home this evening.

Can anyone tell me what the box is to the top of the control panel I have? It looks like the wireless controllers Honeywell sell but it's hard wired in. It just has one red LED and one green LED and a single button.

I can't figure out what it does and could do with some help please?

Many thanks!

 

[Dan Robinson]

Its the wireless receiver for the thermostat you have tucked away somewhere probably with flat batteries.

the heating is on possibly becasue a kind installer enabled the failsafe mode.

 

[Johntheboy]

Ah result!! I stupidly though the thermostat on the wall was wired in! Thank you!