thanks for all the reply's I will check out your suggestions. I remember I was told that the problem would get worse with age. The reason why I purchased the overrun unit was because the Worcester engineer who fitted a new circuit board under the warranty said that it was needed. so presuming...
new to this forum .I hope some one out there can HELP. I have a Worcester 40CDI conventional boiler that kettles when central heating is switched of.I have been told to fit an overrun circuit to the system, this I have purchased,but I don't know where and how to fit it.It has a nice little...