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I have just drained and flushed my open vented ch system after having X400 circulating in the system for a month. The water coming out looked like oxtail soup! Anyway, filled up system but have 2 cold rads, one in lounge (a double) and the other in the kitchen. Have tried turning off all the...

thanks gas4you and dave, pipes from rads all go straight into wall, so looks like its down to draining each one as you say. Thanks for advice. can I just say what a great site this is for plumbing advice, there is nearly always someone who will try to help.

I have to drain my open vented ch system, I have had X400 circulating for a month to try and desludge it. there is what I would call a 'proper' drain tap above the boiler which you can fit a hosepipe to. I presume I can drain the upper part of the system from this tap. However there is no such...

Thanks for advice, so you are saying to drain the system, flush it through as much as possible and then put another lot of sludge remover, say X400 again, and leave that to circulate again. How long do you think I should leave it this time? As regards draining there isn't what I would call a...

Thanks for advice, actual plumbing a bit beyond me but what do you think of this? You will probable think I am crazy! I decided to try and put some wire down the feed pipe to see if it could get to the blockage. I tried 3 different wire types as the problem was getting it to turn ninety degrees...

I posted a query just over a month ago about hot water venting into the expansion tank. I had some useful answers, causes could be a hole in the heating coil in the tank or a blockage or partial blockage caused by deposits of iron oxide probably at the T junction where the feed pipe joins the...

thanks for advice, very comprehensive from avocet, much appreciated. Taking car to garage tomorrow to get plugged in.

I nted the post from poshman about an mil light flashing on a clio. Mt wife has a 52 reg Matiz, the mil light came on yesterday when she was shopping locally. Engine sounds as normal. Have checked for loose wires etc around engine bay but cannot see anything amiss. I realise it will probably...

Thanks again JohnD turned all rads off this time, didn't turn them all off before, this did the trick, all rads hot again. Will now wait to see if X400 does the trick. Many thanks again for your advice.

JohnD, can I draw on your knowledge again please. I have put a 1 litre bottle of x400 into the CH system as you advised. I drained off about 2 gallons of water from the small rad in the downstairs loo as it has the drain valve on it. Afterwards that rad is cold, so assumed an air lock. Tried...

Thanks JohnD for rapid reply, I have cleaned out tank already, all brown sludge in bottom of tank, that stuck to magnet too. Let it refill for now hoping to go and get some X400 tomorrow. Thanks again.

Thanks JohnD have tried the magnet on the T join where you said and it sticks to it well all round that area. You say this can cause a partial blockage. If the pipe is only partially blocked would this cause the pipe to vent the hot water into the tank? The heating seems to be working as well as...

Thanks dan2 pump is running ok, I can hear it whirring away, especially on the over run. Also thanks JohnD will try to investigate your solution, thanks to all for trying to help. If anyone else has any other suggestions they will be welcome.

Thanks mick, not sure where you mean I'm not too good with plumbing, could you expand a bit please. Also someone told me another reason could be a hole in the coil inside the hot water tank, is this possible? I hope it's not that! Sounds expensive.

can anyone help with this problem please? I have hot water venting into the expansion tank in the loft whenever the central heating boiler comes on. I think it has been doing this for a while as I have heard water trickling into a tank say early in the morning when still in bed and the heating...