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Corsa Sport » Message Board » Off Day » House Day » problem with radiators not heating up. » Post Reply
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Dave |
posted on 1st Mar 13 at 19:42 |
Cheers :thumbs: | |
mattk |
posted on 1st Mar 13 at 19:02 |
take the offending rad off, there is a thread under this one tells you how, take it in the back yard and blow it through with the hosepipe on an outside tap, that will get the majority of the shite out of it, hang it back on the wall, do the nuts up, turn the valves on and bleed it. thats all there is to it | |
Dave |
posted on 1st Mar 13 at 18:46 |
Matt, I noticed one of our rads is doing exactly this, the pipe up to the TRV is red hot, as is the top of the rad but as you work your way across to the other side it gets colder and the return pipe is cold. All the other rads are fine. | |
mattk |
posted on 1st Mar 13 at 18:34 |
Combis have a sealed heating system pressureised to 1.5 bar, they dont sludge up often cause no air can get it and the water being pressurised leaves no space for air bubbles, normal systems that have a hot water cylinder are filled by a tank most of the time and have an open vent that goes over the top of the said tank. this vent will let steam out should the water in the system start to boil. The open vent, coupled with the lack of pressure and the increased ability to get small air locks causes open vent systems to sludge up. The fact they are normaly connected to an old cast iron boiler doesnt help. modern boilers have copper or cast aluminium heat exchangers. | |
dannymccann |
posted on 28th Feb 13 at 22:07 |
Out of interest matt, is there a way of preventing this sludge buildup? Sounds like an expensive job especially if its easily preventable (for a non-plumber that is, I assume removing the radiators once a year and flushing them out would be the most obvious answer). | |
mattk |
posted on 28th Feb 13 at 19:53 |
If they are hot at the top then they dont need bleeding, air rises to the top causing them to go cool, when they need bleeding. | |
VegasPhil |
posted on 28th Feb 13 at 19:33 |
Powerflush needed. | |
AndyKent |
posted on 28th Feb 13 at 18:37 |
Might be worth getting the worse ones off the wall and properly flushed out. | |
Ben G |
posted on 28th Feb 13 at 18:35 |
i bought an oil filled radiator to make do over winter and my bills went up massively :lol: so fucked that idea off and decided i need to sort the actual radiators out. | |
Kyle T |
posted on 28th Feb 13 at 18:32 |
Mine are doing the same, tried bleeding and water just comes out instantly... no air. | |
Ben G |
posted on 28th Feb 13 at 18:30 |
never been flushed since we moved in 3 years ago. unsure how old the system is. the boiler itself is about 15 years old, but works well as the hallway radiator gets boiling hot, as do the other 3 upstairs. | |
AndyKent |
posted on 28th Feb 13 at 18:17 |
Keys are easy to get hold of. Might help but usually they need bleeding when the top is cold and the bottom is hot. | |
RichR |
posted on 28th Feb 13 at 18:16 |
they're about 99p from B&Q etc; the only thing is that if they're aired, normally the bottom heats up not the tops as its the air trapped at the top which prevents the water rising and hence has to be bled out. | |
Daniel_Corsa |
posted on 28th Feb 13 at 18:15 |
Twist bleed nipple see if any air comes out. | |
John |
posted on 28th Feb 13 at 18:15 |
Bleeding sounds like a good first step. Your dad will have a key. Some newer radiators have a bit for a flathead screwdriver. | |
Ben G |
posted on 28th Feb 13 at 18:14 |
no. been reading a guide which said i need a key, although i don't have one. | |
RichR |
posted on 28th Feb 13 at 18:07 |
have you bled them? | |
Ben G |
posted on 28th Feb 13 at 18:06 |
been having this problem a while now, but not really done anything about it. |