Hope someone can help,

House is over three floors, with gas fired central heating, boiler on ground floor, hot water tank on middle one.
On Sunday night all the radiators in the house worked fine, but now for some reason only the two on the top floor are heating up, this means the one on the ground floor and two on the middle floor just aren't getting hot at all.

Any ideas as to the possible problem??
Figure it can't be the bolier or the pump as the two furthest away are working fine, could it be the others need bled? or anyone have any other clues/ideas?

Any help appreciated.

Thanks in advance

Steve

Air in the system? have you tried using a radiator key to bleed them?

Hope this helps :)

Dan

Pump would be my first guess, as long as the boiler is working.

If the pump isn't on, the top floor rads often get hot by "gravity feed": ie: the warmer, less dense, therefore lighter water floats up to the highest point in the system while the cooler stuff falls down to the boiler to be re-heated.

Try undoing the large, probably silver coloured screw on the front of the pump, then look and see if the spindle is turning: it sometimes helps to lightly insert a small screwdriver to touch the spindle to see if it really is turning. Make sure the system is on when you do this, and turn any wall stats up to max to ensure the pump should be running.

Don't forget to return wall stats back to naormal when you've done it.

BTW: if the pump has isolating valves at either side of it, it's a simple DIY job to replace it, and new pumps aren't dear.

Alcazar

Like Alcazar says check the pump.
switch on heating
turn room stat up(if you have one)

unscrew silver screw on front of pump(gundfos type) and have a rag underneath to catch drips.look and see if pump spinning.if not then insert small screwdriver and try to spin pump.it may be jammed.
If it still doesnt go then it sounds like pump has gone.have a sniff at the old pump.when they go you normally get a real bad electrical burning smell.

If it has pump gate valves then change it.If it has the ball type valves then drain the whole system and replace with proper pump valves.the ball types are no good.every time i have tried changing a pump with those valves they Pi** out after.
Put proper pump valves on,(Gate type),and use rubber washers supplied with pump,not the fibre ones.

Thanks guys, shows what I know.

Will probably have a look over the weekend.

Cheers

Steve