Central heating

[CountryFan]

I have these ones . Do they need to be fully open . Thanks for your help mate

It depends as the heating system needs to be balanced. As above it seems likely a stuck microswitch in the motorised valve.

 

[Mottie]

I’m surprised nobody has chipped in "It’s not a pump, it’s a circulator……"

 

[ericmark]

What is this pump and what does it do .

circulates the water.

And what is the best number to have it on .

lowest that will work

2nd my heat does not seem to turn down .

this is controlled by the thermostatic radiator valve (TRV) and lock shield valve in the main.

Should the valves on the radiators be fully open .

No.

So the system is, the pump circulates the water either through the radiators if the TRV is open, and the by-pass valve if all TRV's are closed, and the boiler monitors the return temperature and adjusts output, so the return water is cool enough to gain the latent heat from the flue gases.

This system has a flaw, the boiler would never switch fully off, it would cycle off/on all the time, so we try to include a method to turn it fully off, the traditional method was to put a wall thermostat in a downstairs room, with no alternative heating, and normally kept cool, and no outside doors, there is often no such room. So there are other methods, like the TRV linked to a hub, and the hub turns the boiler on/off, or up/down if that type of thermostat.

The boiler often does more than heat one set of rooms, either zones of rooms, or room and domestic hot water (DHW) and to do this we have zone valves, inside the zone valves there is often a micro switch and if that switch sticks closed, then the boiler will not stop running.