circulation pump help

podge018

Firstly, excuse my terminology and general layman-ness, I'm no expert in this field, hence the query I suppose.

So our heating system at home was working fine until the heavy rain 3 weeks ago, had a crowd out who said the pump had been water damaged and needed replacing. He done that and the heating works now.

However, the pump is always on now, regardless of the heating/boiler being on. The pump is sending a humming noise throughout the house that was never there before. This can be lessened by switching the pump speed to 1 but it is still noticeable.

The way our system works is there is a thermostat in the house that turns to up and down, there is no on/off switch. At it's lowest setting (5 degrees I think) the heating never came on, if you wanted heat you turn it up to 20 or so. This probably isn't normal I don't know but it's how it was and worked fine.

In the boilerhouse there's a clock with On/Off/Timer. This was always set to On in the past. Now I have to set it to Off unless I want heat as otherwise the humming noise is ridiculous.

The guy who fixed the pump has been back out and can't get to the bottom of the noise, when it's clearly the pump being on causing it.

Couple of questions:

Should the pump always be on as he has left it?
Has he rearranged the pump so it is now controlled by the clock as opposed to the thermostat?
Could the noise be caused by a newer/stronger pump?
Wouldn't a pump always being on wear a lot quicker than normal?
What exactly is it pumping when the heating isn't on?

thanks for reading that and if you need any more information to answer my questions feel free to ask.

podge018

if it helps it's a Myson pump and Popular 90 boiler.

Billy Bunting

Its just pumping water but shouldn't if the room stat is turned down, it is using power and yes will ware quicker.

It sounds like he has wired it directly to the clock and as you leave this on and just use the room stat then it has a constant supply.

podge018

So if I want to ring this chap back and ask him to "fix it", what can I say? "Put it back the way it was please"?!?!

Seriously though, what can I tell him I want done?

Billy Bunting

Basically yes, it was probably originally wired via the boiler stat, which isn't ideal but simples.

podge018

not ideal you say, but better than how he left it?