The boiler light went out yesterday and we had no heating. Someone changed the thermal cupling valve or what ever its called lol and the boiler light is now back on but the heating will still not work. The thermosat is up high and the heater settings are on. The pipes by the pump upstairs are quite warm and the pump is quity noisy and now and then the pipes bang.

any ideas is it the pump ?

thanks

 

If the boiler's firing, sounds like the pump or air in the system. Bleed all the radiators and high points on the system to see if it's air.

If not, a new pump should set you back £55 for a posh one with variable speed. Quite easy to replace, system might need draining if there are header tanks with no isolation. If you bleed the system, flush it through with a recommended product.


Nik

 

Sounds like air in the system.

 

If it's a Grundfos pump, (likely), you can check if it's turning by unscrewing the large silver screwdriver-slotted nut on the pump face. Only a trickle of water comes out.

Inside, there should be a rotating bit, very small, but a small scredriver in contact with it tells if it's rotating. If it's not, try to free it off with said screwdriver or long-nosed pliers.

Failing that, it's a new pump which is a ten minute job IF the system has isolating valves either side of the pump, and IF you have large enough spanners.

Alcazar

 

dont take it as gospel i had a grundfoss which cooked the rotor tips, it spun and made noises, and water trickled out, but all that was happeneing was it was moving the water round the pump, but not round the system, the pump and the water in the pump got warm but sod all else, as you say a new pump will cure it

forgot tro add, all pumps have the removable screw in the centre, its so they can be purged during commisioning,

a good set of swan necks or water pump pliers will make the job easy

Mart

 

I had to do mine about 6 weeks back: the pump refused to turn, I couldn't free it off, and within a few seconds of turning it on, it got too hot to touch

Alcazar

 

Who needs plumbers when we've got SN??!!

 

Ho! Ho!, don't let Mog and co hear you say that

I have had some very good advice on here though

Alcazar

 

Great explanation there lads, another thread to prove why this board is so good for help and advice very quickly.