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Tony, Thanks for the information. I get the same figures once the boiler has overheated. 233V just before it overheats, 233V as the boiler shuts down, 233 V for about 90 secs after shut down and then 0V. Looks like order a new pump time. I understand your sentiments about not worrying...

Tony, Many thanks for the reply. Have just attacked the box with the electrical connections and it would seem you are spot on. No demand for heat.................. 0V across L & N to pump Demand for heat...................... 234V across L & N to pump No demand for...

Hi, Have a Potterton Suprima 40 which has worked fine for 5 years. The system has cold water storage in roof along with expansion tank - both OK. 2 motorised valves (water/heating) in airing cupboard with Grundfos pump - all OK. When boiler fires up, everything is OK for about 30 mins. Hot...