Potterton Oil boiler overheat puzzle

[ndanson]

I have a Potterton oil boiler that goes onto overheat every few hours. I can't understand why.... however I think it may be due to the pump not circulating the water - I have recently moved the boiler and added about 5m of pipes to do so. The clues are....

1) The pipes near the boiler do get very hot - i.e. you can't touch them
2) The thermostat on the tank (water thermo stat) doesn't seem to change the temp of the hot water - but that may not be true.
3) the boiler stat on the front of the boiler clicks on and off ok. However, I did notice that when off it only clicks on almost all the way around.

Two plumbers have looked at it - one said it was wired up incorrectly - but if so why has it worked ok for 6 years? The other said it may be the pump but didn't really know.

If any one can help I would be much appreciated. I have a very cold house at the moment and a new born baby!

I am based in Manley, Chester if anybody is near and would want to help out.

Many thanks

Nigel Danson

 

[wilhelm]

try boiler stat. this oftens fails, allowing temp to rise and go to limit stat.
although i notice in pottys fault finding guide ..if limit stat trips...err replace limit stat. youd think they would know betterer.

 

[ndanson]

Thanks for that - would that allow the hot water to get really hot as well?

 

[wilhelm]

yes. hi limit will go at 85 deg c ish..

we are talkin that you are re-setting the limit stat? arent we sunbeam???

 

[ndanson]

Yes - the red overheat light comes on on the oil boiler and I have to manually reset it.