On Fri, 27 Oct 2006 03:05:25 -0700, mattbroad wrote:

Hi, this is my first post so please bear with me :-)

I have a potterson conventional boiler in my kitchen (downstairs) and a
hot water cylinder in the airing cupboard in an upstairs bedroom. I
have a control panel that sets when the h/w and c/h comes on. I have a
grundfos selectric 15/50 pump, also in the airing cupboard. Recently
this pump started making a loud whiring/vibrating noise (a bit like the
noise made by Dr Who's tardis) when the hot water came on at 6:30am
ready for baths etc. The boiler still worked, the h/w and c/h still
worked but this noise was too much to take each morning.

I turned the pump up to 3 (was on 1) to see if this would fix it but
made it worse.
I assumed, not being a plumber in any way, that it could be air stuck
in the pipes so I drained one of the upstairs radiators to see if this
would fix the problem. Needless to say it made it worse!! Now when the
h/w or c/h (or both) come on the boiler starts, the pump starts but
after a few minutes the boiler starts making a noise like it is boiling
which increases and then it cuts out (i assume this is to stop it over
heating much like a kettle).
The pump in the airing cupboard continues to work (i assume as i can
feel it vibrating and changing the speed makes it faster/slower) but
the pipes above and below it don't get hot.

Any suggestions would be very welcome before I call an engineer which
could cost an arm and a leg, and how could I enjoy my nice warm house
with only one arm and one leg?!?

Go into the loft and give the float valve some exercise. Chances are that
it has stuck in the shut position and the water has evaporated away.

Hopefully this is the problem then you come down and bleed the air out of
the radiators and hopefully all should be well when you turn on.
Later bleed the air out again when the hating is off.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards