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ok thanks for your advice. i will ask him tomorrow. from the info given, it does seem like the boiler stat is sticking and causing the constnt problem and not the sludge afterall. i obviously don't have a blocked cold feed as water drained from the header tank and the rads vented and spurted...

sorry, i know i am annoying... no one answers my question though!! ok say it was our fault and air did get in ... would this be resolved by draining more water from the system from the drain valve (and thus removing the air)?

see my point was: even if we did let air in, and the boiler went to overheat then why didnt the boiler go to overheat weeks ago when the boiler is pumping over continously, due to a probably boiler stat failure? and there is no overheat reset button on this boiler btw either which can be...

im still here! yes my boiler is wall hung. but a lot of older boilers had no overheat stats apparantly, thus the overheating via the vent pipe. i dont want a new boiler - can't afford it! we drained the water level to the cold outlet which was about 1.5 inches up from the base of the...

got the plumber coming tomorrow. what are the odds though on me and my husband draining some water from the system, to add cleaner to the header tank, and air getting in (as i held the ballvalve up for a few mins when he drained a bit to check we didnt have a blocked cold feed and the tank...

Hi I don't think the flue is blocked - and the flue is through the wall, not an open type through the chimney. i don't have that button though anyway. Thanks for your help though. Can someone please explain this to me though: if my boiler had an overheat cut out , where thew...

yes the system was drained to allow the cleaner into the system. BUT why would the pilot go out if an airlock had caused it to overheat. A) it is an old boiler and may not be so sophisticated and B) the boiler must have been overheating for weeks as the boiler thermostat seems to have...

so if the flue sensor is in line with the thermocouple, why has this caused the pilot to not light? what is the cause? is it a big thing? i am sorry i dont know the model of the boiler.

sorry-the boiler was pumping water over into the header tank after it was on for about 20-30 mins, then this procedure repeats itself every 5-7 minutes. this was happening from about 6-8 weeks ago. i added the cleaner after as i thought it may be sludge causing the vent pipe to discharge...

low tech as in rubbish do you mean?!! i understand what you are saying about air, but surely the boiler was overheating anyway before..... with the boiler stat failure?? so why didn't the pilot go out weeks ago if in series with the thermcouple? doesnt a room stat cut out before the...

Hi Agile: yes the water level went down in the f & e cistern when my husband drained down, i held the ballvalve up. then we added the cleaner and the let the ballvalve go and it went into the pipework. yes i am afraid the boiler has been neglected. i don't know if it has an overheat stat...

sorry for the long post: but the boiler must have been overheating already - as water was coming from the vent pipe before the cleaner was added. so why wouldn't the boiler have cut out before and the pilot gone out earlier, a mean weeks ago? it is an old boiler though. also the pilot...

Have a corgi plumber coming round tomorrow! but am confused now what to ask him/what has happened with your kind replies: basically, what happened was: when the system is turned on, after a while 2 pipes up to the header tank rattle and bang and water comes out of the top pipe. then a...

yes he held it in for quite a while, but when he released it slowly it went out. he said it sparked though and lit but would not hold.

Thank you for your adice and I will have to call a local corgi registered plumber in to service the boiler. It just seemed such a coincidence that about 1.5 hours after I addded the cleaner, it went out! it was very windy though and there was a small storm that night! One point though-if...

Hi there I hope somebody is kind enough to help me...? Basically yesterday I added (or my husband did) a central heating cleaner into the header tank, and drained some water from the drain point near our patio door to get it into the pipes. Late last night our boiler (old, about 15-20...