My Honeywell room thermostat is wall mounted and wireless and on occasion if I wish to over-ride or boost the central heating outside of the normal settings the signal doesn't always seem to be picked up by the boiler. Is the 'receiver' within the boiler? Neither I nor my plumber or electrician can find it in the airing cupboard or near the boiler. Would it be called a receiver or does it have another name which I would find in the User's Manual or Service Manual? I have replaced the batteries but it has not solved the problem. Any suggestions would be most useful. Thanks.