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Thanks. Is there anyway to unblock it if it happens again in the meantime?

PS. Is there a way to clear the pipe? By using compressed air, or a 'sink unblocker' type product?

Looks like the problem in my boiler has come back, so more advice would be appreciated. We had British Gas replace the gas control valve eventually and after that it only made the noise occasionally. Then during 2010 the original installers removed some unnecessary bends in the condense pipe...

Right it seems that the problem is the condensing pipe. The trap keeps filling up which causes the noise. I am going to connect a pipe to the condensing outflow and run it into a bucket to ensure that it is definitely the pipe which is at fault. Does anyone know if it is safe to run the boiler...

Hi, nope can't hear any bubbling when operational. I am going to get British Gas out again as I can't get it to ignite at all now. Even if it is sludge I can't believe it would cause it not to ignite at all.

Thanks. I forgot to mention that the condenser pipe does not go straight out of the house, there are a couple of 45 degree angles in it, I have phoned Ideal and they say that may well be the issue as it would disrupt the airflow. The trouble is that the pipe is tiled in so would require a lot of...

Hi, I have an Ideal Icos boiler around 3 years old and when it first fires up, whether it is from a cold start or just re-igniting after shutting down for an hour or so it makes a very loud vibrating noise. Sometimes it does it for a couple of seconds, sometimes it just keeps happening and...