I have a Combi System Worcester Heatslave oil boiler which contains a
Bosch water pump. When I remove the large screw on the front of the
pump water comes gushing out. Is this indicative of a problem with the
pump?

When I have removed the similar screws on Grundfoss pumps water has not
come rushing out and I have been able to use a small screw driver to
make sure that the rotor can rotate.


--
Michael Chare

On Friday, 15 February 2019 08:35:48 UTC, Michael Chare wrote:

I have a Combi System Worcester Heatslave oil boiler which contains a
Bosch water pump. When I remove the large screw on the front of the
pump water comes gushing out. Is this indicative of a problem with the
pump?

it's normal with CH pups.

When I have removed the similar screws on Grundfoss pumps water has not
come rushing out and I have been able to use a small screw driver to
make sure that the rotor can rotate.

Usually it does come out.


NT

What is it then, just a thrust bearing?
Seems a little crude. No wonder my neighbours pump sounds like its big ends
gone all the time....
Brian

--
----- --
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
wrote in message
...
On Friday, 15 February 2019 08:35:48 UTC, Michael Chare wrote:

I have a Combi System Worcester Heatslave oil boiler which contains a
Bosch water pump. When I remove the large screw on the front of the
pump water comes gushing out. Is this indicative of a problem with the
pump?

it's normal with CH pups.

When I have removed the similar screws on Grundfoss pumps water has not
come rushing out and I have been able to use a small screw driver to
make sure that the rotor can rotate.

Usually it does come out.


NT

On 15/02/2019 08:56, wrote:
On Friday, 15 February 2019 08:35:48 UTC, Michael Chare wrote:

I have a Combi System Worcester Heatslave oil boiler which contains a
Bosch water pump. When I remove the large screw on the front of the
pump water comes gushing out. Is this indicative of a problem with the
pump?

it's normal with CH pups.

When I have removed the similar screws on Grundfoss pumps water has not
come rushing out and I have been able to use a small screw driver to
make sure that the rotor can rotate.

Usually it does come out.


NT

Thank you for your reply. If I remove the screw the shaft does not
rotate by itself when power is applied. I can turn it quite easily with
a screwdriver. There is an arrow on the cover which I assume indicates
the direction of rotation (anti clockwise.)

--
Michael Chare

On 15/02/2019 09:37, Michael Chare wrote:
If I remove the screw the shaft does not rotate by itself when power is
applied. I can turn it quite easily with a screwdriver.

Either power is not being applied or its ****ed.


--
Any fool can believe in principles - and most of them do!

On 15/02/2019 09:39, The Natural Philosopher wrote:
On 15/02/2019 09:37, Michael Chare wrote:
If I remove the screw the shaft does not rotate by itself when power
is applied. I can turn it quite easily with a screwdriver.

Either power is not being applied or its ****ed.


It turns out that I can just buy a new head which may be easier to fit
for £100.

On 15/02/2019 09:47, Michael Chare wrote:
On 15/02/2019 09:39, The Natural Philosopher wrote:
On 15/02/2019 09:37, Michael Chare wrote:
If I remove the screw the shaft does not rotate by itself when power
is applied. I can turn it quite easily with a screwdriver.

Either power is not being applied or its ****ed.


It turns out that I can just buy a new head which may be easier to fit
for £100.
Check that is is not a failed capacitor in the plastic box on the side
also that the speed switch is not dodgy or between settings.

On Friday, 15 February 2019 09:39:08 UTC, The Natural Philosopher wrote:
On 15/02/2019 09:37, Michael Chare wrote:

If I remove the screw the shaft does not rotate by itself when power is
applied. I can turn it quite easily with a screwdriver.

Either power is not being applied or its ****ed.

It doesn't necessarily mean that. Removal of the screw can cause stoppage, and return of the screw can make it run fine again.


NT

On 15/02/2019 10:18, Bob Minchin wrote:
On 15/02/2019 09:47, Michael Chare wrote:
On 15/02/2019 09:39, The Natural Philosopher wrote:
On 15/02/2019 09:37, Michael Chare wrote:
If I remove the screw the shaft does not rotate by itself when power
is applied. I can turn it quite easily with a screwdriver.

Either power is not being applied or its ****ed.


It turns out that I can just buy a new head which may be easier to fit
for £100.
Check that is is not a failed capacitor in the plastic box on the side
also that the speed switch is not dodgy or between settings.

When I used a small screwdriver to turn the pump it did make a slight
scrapping sound so I went and bought a new pump head, which turned to be
made in Serbia by Grundfos a Dansih company. The new pump head did have
a label with Bosch written on it. Fitting the new head was quite easy,
much easier than trying to undo those big nuts on the isolator valves
for Grundfos pumps. I am pleased to say that my radiators are now warm.

--
Michael Chare

On Friday, 15 February 2019 13:26:08 UTC, Michael Chare wrote:
On 15/02/2019 10:18, Bob Minchin wrote:
On 15/02/2019 09:47, Michael Chare wrote:
On 15/02/2019 09:39, The Natural Philosopher wrote:
On 15/02/2019 09:37, Michael Chare wrote:
If I remove the screw the shaft does not rotate by itself when power
is applied. I can turn it quite easily with a screwdriver.

Either power is not being applied or its ****ed.


It turns out that I can just buy a new head which may be easier to fit
for £100.
Check that is is not a failed capacitor in the plastic box on the side
also that the speed switch is not dodgy or between settings.

When I used a small screwdriver to turn the pump it did make a slight
scrapping sound so I went and bought a new pump head, which turned to be
made in Serbia by Grundfos a Dansih company. The new pump head did have
a label with Bosch written on it. Fitting the new head was quite easy,
much easier than trying to undo those big nuts on the isolator valves
for Grundfos pumps. I am pleased to say that my radiators are now warm.

Next time just turn it several turns, you may find the scraping ceases & it runs well again.


NT