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Thanks Boilerman2 Sorry for not responding sooner. Problem cured now. It was a sticking valve. Paid Heating Engineer to look at it and he found it wasn't closing. Suggested to buy a new one. I took it apart first, operated it several times and now it works. Checked microswitch and it was...

Hi I'm a newbie to the forum. I hope I can describe my problem so people can understand. Please bear with me. We have a Worcester Danesmoor 15-19 oil boiler. The system has developed a problem where the circulation pump is running all the time, even when everything else is turned off. I...