Worcester R28 Bolier Temp Control Not Turning Boiler Off

[nodyland]

Hi all,

I have a Worcester R28 Boiler. It is a closed unvented pressurised system. The boiler is located outside in outhouse.

The boiler has two dials. Heating temp control and Hot water temp control.
It also has a digital gauge that tells you the temp of the water.

When I fire up and say I set the Heating temp to say 60 for example I would expect it to shut down and when it drops etc to then fire up.

Am I wrong in thinking this. I ask because the boiler will just keep running all the time for however long the timer is set for.

Many thanks for your help

 

[stem]

It depends how much heat is being emitted by the system the boiler is connected to. If it is as much, or more than the heat the boiler is putting in, it won't go off.

Older boilers had only two settings for their gas valve 'on' or 'off', so they were continually switching between the two in order to maintain the correct temperature. Many modern boilers modulate the size of the flame to suit the heating load so may run continually but at a lower heat. I suspect that yours maybe one of them.

You don't say if the digital reading exceeds the set temperature, but if the boiler was overheating, its own safety mechanism would shut it down. However, if you are worried, you can buy a cheap strap on thermometer for about £10 to £20, fit it to the flow pipe to check what temperature is being reached.

 

[nodyland]

Many modern boilers modulate the size of the flame to suit the heating load so may run continually but at a lower heat. I suspect that yours maybe one of them.

Thanks for your reply

Hence why I hear the fan go from high and then goes low and stays low just to maintain the set temp?

 

[nodyland]

No the digital reading doesn't exceed set temp.

 

[stem]

There you go then, it's doing its job. I'm assuming here that it does reach the set temp.

 

[nodyland]

Hi. Yes it does. I wasn't sure if it was meant to shut off or not when temp reached. Thanks.