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I have a pumped, gas heating system that was installed c1989 in a domestic, two-storey home. The boiler is a Potterton Netaheat Electronic. The pump is a Grundfos Selectric, marked "Type UPS 15-50 130". P/No.59525600. There is a cistern ('expansion tank') for the heating system in the attic. In...

Tony, please accept my apologies. I had read the rules before my original post. I thought the restriction would include not giving guidance on how to fix a problem. I didn't realise it also included discussion on how the problem would develop if left alone, or discussion of likely causes. As...

Mike, many thanks for your reply and the link. I'm not sure whether it's the boiler cycling but I thought it was just the pump running without the boiler running (the pump continues when I turn the water heating off). Also, if I switch the central heating on and then immediately off it causes...

Thanks for your reply Tony. I'm sorry, I was unaware of any restriction on advice of likely causes of any problem for the burner firing. I don't want to get a technician in who struggles to remedy the problem and instead gets distracted with trying to repair other items (which has happened...

I have two issues which I think are quite separate: 1. I have a Netaheat 16/22 Potterton boiler which is heating the system but has a firing-up anomaly. When the system requires the boiler to start / fire-up the following happens; (i) the boiler fan comes on OK (ii) in one click the...

Once again, thank-you for all the kind and helpful replies. As onecog kindly confirmed, the exact model I had (original) is obsolete now. I suppose that's the risk when being so kind to kit that is kept for 24 years (when the original warranty is usually 1-2 years). I was having difficulty...

Oh crikey! So I may not need to replace the motor but just the capacitor? Other than removing the whole pump (to get access to the electrical connections panel and thence the capacitor), is there any way to find out (a) exactly what capacitor I need, and (b) where I can obtain one quickly...

Thanks for all the replies and kind help. Sorry if I I'm being a bit slow about what to do. I shall endeavour to replace the pump today and then investigate system cleansing. BTW, when I depress the ballcock in the header cistern water feeds into the cistern as expected. Would it...

I manually set the diverter valve to 'MAN OPEN'. I powered the system back-on (the 'gas-fired water heating device' fired up) and I unscrewed the seep-cap. The CIRCULATOR spindle wasn't rotating!!! I manually rotated the spindle with a screwdriver (fortunately in the correct direction) and the...

If I do that in a live system; (a) won't I be at risk of being soaked by scalding water? (b) even if the spindle is spinning will there still not be a doubt as to whether the impeller is working (maybe the impeller is heavily worn or even disintegrated?

Expansion tank water seems quite clear.

Many thanks for all the ongoing help here. So from the information I have given, and notwithstanding that the system would benefit greatly from a cleanse of some sort, would you say the pump is the mostly likely point of the sudden failure?

Tony, thanks for your reply. Please excuse my ignorance, but what is 'pumping over'? Also where can I access the FAQs - and what should I look for please? Is it likely the pump has failed? Would it make sense to replace the pump tomorrow, get some form of heating back and then plan for...

Thanks for your replies. In the scheme of things, i.e. it is winter and I have no heating, can I just replace the pump first? In addition to the corrosion, what would seem to be the likely cause of sudden heating failure please?

Well I'm not too cold yet but the house is defiant cooling down!!! I have a fairly conventional gas fired boiler (1989) pumped from upstairs with a diverter valve for central heating / hot water, and a mains-pressure sealed hot water tank. The heating was working fine until this afternoon...