C/H Boiler - The solution??

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Hi,
Some weeks ago I asked about my Jaguar Combi which kept giving overheat fault messages.
Anyway - having had 2 CORGI engineers look at it, on both occasions it worked fine, so they couldn't diagnose the fault, although one said that the pump could be binding, thus causing an intermittent overheat as the hot water isn't pumped away.
So... each time I turn it on or up, I listen to the pump with a screwdriver.
The overheat occurs immediately if the pump doesnt run when the boiler fires up, and there is no immediate overheat if the pump is running when it fires up. It always eventually gives the overheat fault code, but I cant be sitting there with a screwdriver in my ear 24/7, so I dont know if the pump is stopping before the overheat.
It is therefore my guess that either
1) The pump is knackered and needs replacing or;
2) something is intermittently sending a signal to the pump not to run - which doesnt solve the problem <g>
Is 2 possible? or is 1 highly likely?
--
Richard Faulkner

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On Mon, 17 Nov 2003 22:40:40 +0000, Richard Faulkner wrote:

I think both are possible, although running pumps tend to keep running AFAIK which would make for (2).
Perhaps you could change the pump (which is not a huge expense) and see if that fixes the problem.
--
Ed Sirett - Property maintainer and registered gas fitter.
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How much should a pump + fitting be?
The Grundfoss pumps I have seen seem to be around 125+VAT or so, so I would guess supply & fit would be around 200??
--
Richard Faulkner

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You can get a pump from Screwfix for 35 quid and it is very simple to fit, assuming the pump valves work. You can test if the valves are working by attempting to turn them off.
However, if the pump is internal to the boiler, which is quite likely in a combi, you may find it is a custom built item available for 2000 quid only from the manufacturer.
Christian.
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The pump heads are generally common items. You could buy a 25 pump and take off the pump head and replace with that.
--
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That wouldn't have worked with my pump. It sounded like a washing machine full of marbles!
Christian.
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A friend had a problem with his heating not managing to warm up the radiators although everything sounded like it was running OK. In despiration he replaced the pump, and much to his surprise this fixed the heating. Upon inspecting the old pump, it had no impeller blades left, all of them having broken off. He never did find where they went, but heating's been fine ever since...
--
Andrew Gabriel

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writes:

machine
Always best to install a strainer on the boilers return protecting the pump and boiler.
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Andrew Gabriel wrote:

They are currently blocking IMMs 'mocrobore' sludge pipes....:-)

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You've just given me a horrible image in my head of IMM's sludge pipes. ;-)
Christian.
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On Wed, 19 Nov 2003 17:37:04 -0000, "Christian McArdle"

Doesn't bear thinking about, does it?
.andy
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writes:

machine
You have been in the pub all afternoon haven't you?
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IMM wrote:

No, I went to the bank and the supermarket.
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writes:

And drew out money and darted into the boozer.
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IMM wrote:

Why on earth should I? I've got better drink here. Not that I have had any of it for a couple of days.

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writes:

pump
Sad bastard eh! Sit at home at the meths rather than socialise with proper people.
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IMM wrote:

I don't need to drink to socialise, you sad peasant.

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writes:

proper
A demonstrable attitude of snotty uniness. Tony Blair should send 500 bulldozers right through those two pieces of slum.
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IMM wrote:

Ah. Another pice of brilliant deductive reaosning
(i) IMM didn't go there (ii) peopel that go there are better than IMM (iii) they must therefore be slums (iv) if its implementation of greed, envy, jeaolousy and cowardice politics you want, Nu Laber will always see you right.

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Wouldn't be seen dead in those places.

Not true. I am much superior than all of them.

Ever looked at those places?

See this is how the snootiness manifests itself.
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