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This was done by the plumber when he finally commissioned the system but it had been filled up for about 4 months without inhibitor. Would this be enough time to cause this problem due to sludge? I guess what im getting at is the system leaking or not. From what your saying, air...

can you go into more detail about that? how does sludge cause an air pocket? Is there anyway of correcting the problem if it is?

Hi Guys, I've got a new boiler and central heating system (about a year old) which may have a problem. I had to remove the towel rail about 6 months ago to fit a new heating element as the old one had blown. I then did the following as instructed by the plumber: re fitted the towel rail...

Its all working as it should now. I've just got to get the settings right on the thermo and everything should be fine. :D

I have done the above and have connected terminal 3 on the boiler to the L next to the N and the A in the relay is linked to the L next to it as shown in the diag. The relay appears to be doing what it should with the green led going on and off but the boiler doesnt fire. Is there anything...