heating not staying on.

[Ratman71]

I’m trying to get my head round the heating in my house.I can’t seem to keep the radiators at a constant heat.They come on get hot then after a while cut out again and cool down,then when I turn the room stat up more it clicks on again then heats up but after a while cools down again.just as it shuts off and cools down the room thermostat starts buzzing quite loud as if an egg timer is going off in the kitchen,is this normal cause I have never heard this before in any other houses or does it sound like the room stat is knackered.if you could help me out with this heating problem that would be great.
p.s it is a honeywell room stat and i have no TRV's on the rads that i can see.
thanks for looking oh and replying if you do so.

 

[Agile]

I dont really understand what you are trying to explain.

Best to get an engineer to service boiler and check system.

Tony

 

[D_Hailsham]

I’m trying to get my head round the heating in my house.I can’t seem to keep the radiators at a constant heat.They come on get hot then after a while cut out again and cool down,then when I turn the room stat up more it clicks on again then heats up but after a while cools down again.

The problem is caused by the wide switching differential in your thermostat.

The house heats up until the thermostat turns the boiler off; but the temperature in the house continues to rise above the set temperature due to the heat retained in the rads. The house then starts to cool down. Due to the wide differential between the on and off temperatures of the stat, the temperature drops more than you would like, so you turn the thermostat up: and the house gets too hot!

Older thermostats partly overcame this problem by having a neutral connection to the stat. Remove the thermostat from the wall and check how many wires are connected and to which terminals. If there are only two wires, there is no neutral; three wires could have a neutral or an earth, depends on which terminals are used.

If there are only two wires, the easiest option is to replace the thermostat with a modern digital version, which does not exhibit the wide differential. They are all two wire.

 

[Ratman71]

thank you D Hailsham

 

[Agile]

They way I follow your post the problem is that you expect a constant temperature on your radiators.

The only way you can get that is with a modern boiler and either weather compensation or a proportional room thermostat.

You should be assessing the heating by measuring the room temperature and not feeling the radiators!

Tony

 

[Ratman71]

thanks tony,appreciated.i have only been in the house 1 week so i think i will buy a thermometer and see when the stat cuts out.because it was making this mad buzzing noise which quite frankly made me jump the first time i heard it i didnt know if the stat was broken and basically doing what ever it wanted.is this common too about the buzzing.

 

[Agile]

Its not normal for stats to make any noise. But I dont know what model it is!

A photo might help.

Tony