Thermostat issues -- any help would be appreciated!

[LD929]

Hi, I just had a new heating system put it. I have recently noticed an issue that is frankly baffling me: the boiler will not turn on in the evening (it turns on fine in the morning) despite that the thermostat / central heating saying that it is on. I made a small video showing the problem. Any advice would be greatly appreciated!

[ed_pete]

OK - I can't quite see but on the wireless receiver you have a green light on. Are you sure that this is not just a power LED and that there's not another LED that comes on when it receives the signal from the thermostat (Mine has two LED's one for power, one for "call for heat" from the thermostat) ? Is there an override switch on the receiver to force it on ? I've had trouble with mine before receiving interference from other devices that communicate on the same frequency. I had the opposite problem, our boiler was coming on in the middle of the night when the programmable thermostat was off. I changed the frequency that the thermostat and receiver were on (how you do this will depend on the model - maybe you have a manual ?) and that sorted it out.