Grundfos pump

[chunks99]

I am looking to replace a faulty Grundfos central heating pump being a TOTAL novice would really appreciate some advice. Pump is a 15/50 pump but is a class F showing various pumping rates 1800rpm, 1150rpm,etc. I can find 15/50 pumps on line but class H with varying pump rates and also class F's with again varying pump rates. Is this such a big deal or can I buy any class F or class H? Any help/advice would be appreciated. I would change this myself would get someone who knew what they were doing!

 

[chunks99]

*wouldNT change myself.......

 

[St0rmer66]

Totally interchangeable. Don't worry about it.

 

[chunks99]

Thanks. Is it an epic to change? would attempt myself! Current pump is vibrating noisily and tried air bleeding as suggested

 

[St0rmer66]

Depends if the pump valves are knackered or not. If they haven't been used for a while (normally the case!) then they could either leak from the spindle or not fully close off the water to the pump. You won't know this until you try by which time it'll be too late. So unless they're shiny new pump valves I wouldn't bother if you've never done it before!

I would be questioning more "why" this has happened to the pump. Is it just age? Could be blockage in the system or the system running dry etc. Another reason to get someone who knows what they're doing in!

 

[chunks99]

Totally agree and will be definitely getting someone who knows what they are on with! It definitely isn't running dry or blocked; my theory is age! The system is old and looking at the modern grundfos pumps to buy today the one currently fitted looks a good 15/20yrs old maybe even longer.
It has quietened down a little, but even I know central heating noises need investigating and being a born worrier about these things I'll be sorting whilst during the scorching UK summer months....

 

[Richardthe3rd]

Here's replacement 15/50s for £23.
http://www.antaresint.com/PUBLIC/php/first.php?PHPSESSID=jckkpk84ebs0ij0u530cktjgi4

If you get a good time served tradesman in & not a course cowboy, he may 'clean the can' of the circulation pump. That maybe all it needs??

 

[Agile]

Maybe a 15/50 but not a Grunfos!

The there is VAT and carriage to be added to the price.

 

[Richardthe3rd]

Maybe a 15/50 but not a Grunfos!

The there is VAT and carriage to be added to the price.

Very true Tony in every regard, however, the option is there....

 

[chunks99]

Have turned the setting down to no. 2 (3 settings??) and it is working fine. Still a little noisy but it seems OK. Still thinking about getting someone to take a look at it though just to be 100% safe