UFH circulating pump has stopped. I'm cold!

[Brix]

Power is on. Zone actuators seem to be working as normal - several are open/on.

Wilo SB60 bronze pump  is not doing anything. 

Pump is less than three years old. 

 

Has been working fine until this afternoon. Thermalstore, hot water, etc.. all working ok.

 

These pumps are about £550 - what goes wrong with them and are they serviceable? Or can anyone think of anything it might be other than the pump itself?

[PeterW]

No need for a bronze pump in a heating circuit

 

Undo the centre screw cover and see if you have any water in the gland - some have a slot in the end for you to give it a twist. 
 

Or a couple of sharp taps with a hammer although if it was working and is not now, that sounds more electrical. 

 

 

[PeterW]

if it’s knackered, swap it for one of these. £80

and keep the change... 
 

https://www.screwfix.com/p/wilo-yonos-pico-25-1-6-130-glandless-circulating-pump-230v/6153x#product_additional_details_container

[Brix]

Bronze as can't have any ferrous on the system - it corrodes the UFH pipes (Kee Triple Tube, old system, discontinued, lots of documented cases of pipes literally disintegrating). 

 

I undid the screw earlier and water came out. I thought the pump was glandless?

[ProDave]

Strange choice of pump for UFH.

 

Try turning the speed adjuster switch, sometimes the contact gets dirty and just exercising the switch cleans the contacts.

 

This would do as a replacement if that does not fix it https://www.ebay.co.uk/itm/CENTRAL-HEATING-CIRCULATING-PUMP-Wilo-Pump-1-1-2-6M-180mm-Pump/362783491642?hash=item547794c63a:g:LikAAOSwKINdqDCT

[ProDave]

Check carefully, I have a Wilo Yonos pump in mine. They come in lots of different versions, and one of mine has a plastic body so would fit your "non ferous" criterea

[PeterW]

10 minutes ago, Brix said:

Bronze as can't have any ferrous on the system - it corrodes the UFH pipes (Kee Triple Tube, old system, discontinued, lots of documented cases of pipes literally disintegrating). 

 

I undid the screw earlier and water came out. I thought the pump was glandless?

Ok so go with a PU bodied Grundfos at £72... 

 

https://www.euroboilerparts.co.uk/pu130-5-grundfos-pump-1-12-plastic-body-replacement-for-grundfos-bronze-pump-1205-p.asp

 

 

[Brix]

9 minutes ago, ProDave said:

 

 

Try turning the speed adjuster switch, sometimes the contact gets dirty and just exercising the switch cleans the contacts.

 

This would do as a replacement if that does not fix it https://www.ebay.co.uk/itm/CENTRAL-HEATING-CIRCULATING-PUMP-Wilo-Pump-1-1-2-6M-180mm-Pump/362783491642?hash=item547794c63a:g:LikAAOSwKINdqDCT

Thanks. Tried the adjuster but nothing.

 

Plastic body may be the go.

[Brix]

2 minutes ago, PeterW said:

Ok so go with a PU bodied Grundfos at £72... 

 

https://www.euroboilerparts.co.uk/pu130-5-grundfos-pump-1-12-plastic-body-replacement-for-grundfos-bronze-pump-1205-p.asp

 

 

Nice one. Is that same size and power etc.. (not entirely sure what is essential.)

 

Are plastic bodies a more recent development ? - would explain why not specified in install docs in 2003.

[Brix]

I certainly will not be sad if I never have to buy another SB60 again!

[PeterW]

PB bodies have been around for the past couple of years. Got much cheaper too ..!!

 

Can you get the exact model and also measure from nut to nut as they do both a 130 and a 180mm body SB60

 

 

[Brix]

Nut to nut on mine is 180.

I haven't found that info on the Grundfos.

 

Depth	145 mm
Height	180 mm
Width	96 mm
Weight	2.94 kg
Maximum Head	6000 mm
Number of Phases	1
Maximum Pressure	10 bar
Maximum Flow Rate	1.5 l/s
Material	Bronze
Colour	Bronze/Green
Voltage	230 V
Type	Domestic
Made To Order	N
Manufacturer Model No	4035483
Brand Name	Wilo
Range Description	Wilo-SB

 

[PeterW]

Fit an adapter then - takes 2 mins. 

 

https://www.toolstation.com/pump-adaptor/p75109

[Brix]

Lovely - thanks for the advice.

 

Do I need to worry about any of the other specs - e.g. flow rate, head etc..

 

The uppermost floor is about 2m above the pump. Servicing 8 zones.

[PeterW]

Nope those Grundfos units can do a 6m head comfortably. 

[Temp]

At very least I'd check it's getting electricity before thinking about replacing it.

 

If it's really faulty I'd want to know what went wrong with it.