Northy
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| posted on 7/11/06 at 01:06 PM |
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Noisy central heating
Hi guys, hope someone can help.
Every morning when the central heating kicks in it is very noisy, the noise is coming from the airing cupboard and sounds a bit like a pump that is
catching as it spins, does that make sense?
The noise gets gradually quieter until its gone as the system heats up.
Any ideas? Is it fubar'ed?
Cheers,
G
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing! 
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Schrodinger
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| posted on 7/11/06 at 01:15 PM |
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Hi Graham
It sounds like there could be air in the system. I would check to make sure that the ball cock in the header tank is not stuck closed with no water in
the tank and bleed the system,
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owelly
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| posted on 7/11/06 at 01:18 PM |
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sounds like the pump is telling you to save up for a new one!!
What speed setting is it on? Try turning it down.
http://www.ppcmag.co.uk
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Northy
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| posted on 7/11/06 at 01:19 PM |
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2 questions:
What does the pump look like!
How do I bleed the system?!
Cheers
G
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing!
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Aboardman
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| posted on 7/11/06 at 01:30 PM |
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pump is normally about 4" across with 2 pipes coming into, and 1 electric cable.
here is a site about bleeding the radiators.
http://www.diydata.com/problem/central_heating/bleed.htm
[Edited on 7/11/06 by Aboardman]
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StevieB
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| posted on 7/11/06 at 02:06 PM |
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Pump will look like a plant pot shaped object stuck onto the pipes somewhere near your boiler/tank. They're not too expensive to replace
(£60ish).
Bleeding the system is quite easy - just do a bit of web research first.
I got used to all this stuff when I bought my new house (and I mean new - only 6 years old) and the CH is proper f****d. Bad design means all of the
microbore piping is clogged up and will need replacing (according to a neighbour with a similar problem who's a plumber).
I solved it by wearing a jumper until summer came. Now that Mrs StevieB has 7 months left on the build time for baby StevieB, I need to get it
properly fixed.
Where's my big hammer...
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Northy
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| posted on 7/11/06 at 02:36 PM |
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Thanks for the replies so far guys.
I'm just trying to sort out what type of system we have. We have a boiler in a cupboard in the kitchen and also a large water tank with a jacket
fitted in the airing cupboard.
Does this mean it is not a sealed system? Should there be a header tank for the water tank in the loft?
Last time I was in the loft all the tanks had water in and were ok. Do I just bleed the radiators and let it top itself up?
Cheers,
G
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing!
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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StevieB
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| posted on 7/11/06 at 02:46 PM |
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First, shut off the boiler.
To bleed the system, you need to turn off the water supply to your system (if it's a tank in the loft, just use a piece of wood to prop the
float up).
Then find the outlets on the system (ground floor, little nozzles on the return end of the radiators).
Attach a length of hose and get plenty of towels (I use a watering can to drain into and pour it down the toilet).
Then, open the valve and water will start flowing. Open the bleed vents on upstairs rads to let air in and the flow will be better. Then just keep
going around the house until the system is completely dry, and you can do pretty much what you want (remove/inspect/replace the pump etc.)
You'll be amazed by the amount of crappy stuff that comes out of the system!
Whe you refill, don't forget to chuck some inhibiter in to protect from rust (£20 from Plumbworld).
Might be worth running some system flush through as well while you're at it.
[Edited on 7/11/06 by StevieB]
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Aboardman
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| posted on 7/11/06 at 03:02 PM |
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quote:
Originally posted by StevieB
First, shut off the boiler.
To bleed the system, you need to turn off the water supply to your system (if it's a tank in the loft, just use a piece of wood to prop the
float up).
Then find the outlets on the system (ground floor, little nozzles on the return end of the radiators).
Attach a length of hose and get plenty of towels (I use a watering can to drain into and pour it down the toilet).
Then, open the valve and water will start flowing. Open the bleed vents on upstairs rads to let air in and the flow will be better. Then just keep
going around the house until the system is completely dry, and you can do pretty much what you want (remove/inspect/replace the pump etc.)
You'll be amazed by the amount of crappy stuff that comes out of the system!
Whe you refill, don't forget to chuck some inhibiter in to protect from rust (£20 from Plumbworld).
Might be worth running some system flush through as well while you're at it.
[Edited on 7/11/06 by StevieB]
what you have explained here is how to drain the system this is required if you have to change the pump unless the the pumps is isolated with valves
either side of it.
to bleed the system have the heating going, and then go around each radiator and use a bleed key/screwdriver at the top valve of the radiator. you
will need a towel unless you want to spray yourself and walls with dirty water.
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Peteff
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| posted on 7/11/06 at 04:03 PM |
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Don't use a towel, get an old rag or you will get you earhole chewed  . If the pump is sticking undo the blank in the middle of the pump top
with a large screwdriver and then turn the spindle in the centre with a small screwdriver. I have to do this occasionally if the pump isn't used
for a few months. Don't panic if a little water gets out, it soon stops.  Grundfos are good pumps and are about £60-£70 as mentioned above.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Northy
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| posted on 7/11/06 at 08:38 PM |
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Right, I've had a look.
Got no air out of the radiators. The pump is a myson compact cp53. The speed was set flat out (3) so I've set that to 2. It does sound a bit
noisy when it runs, I wonder if the bearings are on there way out?
When I do th emanual start spin thingy on it, it doesn't spin really free, it sort of grinds a bit. Is that right?
Cheers,
G
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing!
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Northy
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| posted on 7/11/06 at 08:43 PM |
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Almost forgot, I tried turning the pump onto speed 1 and it would not turn, just buzzed a bit. I guess this is a sign the bearings are
fubar'ed?
Cheers,
G
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing!
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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JoelP
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| posted on 7/11/06 at 09:08 PM |
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certainly sounds likely graham, though there is still the possibility that it is just a lot of smeg caught in it. Start by draining it and having a
look in. As someone said, it might be worth getting it flushed out whilst you're at it.
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owelly
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| posted on 7/11/06 at 09:17 PM |
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As I said, new pump time!!
If you buy a cheap one (£15ish) you can expect to buy another one in a few months time! You may be lucky and get one that will last a full year but I
recommend gettinga good one. Grundfoss (as mentioned) are good units. Goto a reputable plumbers place and look to spending over £45 minimum.
I suspect the mech seal has started to break-up and jas let water into the bearings.
http://www.ppcmag.co.uk
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Guinness
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| posted on 7/11/06 at 09:17 PM |
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Our pump started to go this time last year. After a summer of inactivity it sort of rusted up a bit. My mate who's a plumber explained that
little bits of rust can jam the blades, so you have to bump start it by unscrewing the hex bolt in the middle a bit, pulling it out a bit and turning
it. This worked for a while but we got sick of it so changed the pump. Not too difficult, 3 wires, two really big nuts to undo.
(P.S. I am completely unqualified to offer advice about this, so don't blame me if thats wrong)
We are currently redecorating the living room and dining room and have taken the rads off to flush them through and decorate behind them.
Mike
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