why do my central heating radiators make banging noises?
The noise occurs when a Thermostatic Valve is just about to shut off the flow of water through a radiator.
As the trv begins to close the water is put under an increased pressure by your circulating pump , causing the noise , if it really annoyes you, you could change your pump to a variable speed pump , which increases or decreases its speed according to the pressure it is under , an expensive solution ,
My window air conditioner has water in the pan when the fan starts up; should I drill a small hole?
hot water filling up
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Sounds like an air lock and they need drained?
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Probably ‘cos they got air and junk in, and need FLUSHING out.
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Because is about to explode:-D
lol,lol… Ok, back to normal… I have no idea:-T
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try bleeding them with key? turn heating on bleed one by one until water comes out, its just an air bubble floating around
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When the radiator is expanding due to the heat from the water makes the metal heat up and the molecules in the metal push themselves apart because the atoms have more energy and they resonate or vibrate. This resonating makes causes air molecules to vibrate away from the radiator as sound. So in short the radiator is expanding from heat and making sound.
This is normal and nothing to worry about. However if the tops of the radiator do not warm up they may need bleeding as air pockets have collected stopping water from getting to the top part of the radiator. Bleeding releases the air.
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ghosts
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Could be an airlock. Use a radiator key and bleed the radiators. Open the valves at the side of the rads with the key and let the air out. When water starts to come through close the valve.
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As the trv begins to close the water is put under an increased pressure by your circulating pump , causing the noise , if it really annoyes you, you could change your pump to a variable speed pump , which increases or decreases its speed according to the pressure it is under , an expensive solution ,
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Various answers, one possibility not so far mentioned is the fact that at least one of your radiators should NOT have a thermostatic valve fitted. This would preferably be the one nearest to the pump.
Air locks in pipes can be noisy, but air locks in radiators rarely are. Having said that, bleeding is still a good idea.
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When the water shuts of it causes the rad to move slightly because of thr preasures. On the wall the twohanging plates that the rads hook on to should have a plasticsleave to stop this , they sometimes grt missed on installation or wear through and fall of after time. Look down the back and look for the colour blueif you don`t see iyt then you need to replace them,they also come of when removing rads to decorate.
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Ive had this before years ago and I went and had a look at the central heating header tank in the loft ( and I dont know why? maybe GOD didnt want us to die in a boiler EXPLOSION )and OMG it was empty.
The filler valve had somehow got itself jammed shut (rust/dirt in the water ?).Anyway a bit of jiggling the valve about and the water was flowing and refilling the system.Got a new valve later.
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try to bleed any air out of the system by using the bleeder located on each radiator. they are located in different spots depending on the maker. if it is just a noise once in a while it is probably just expantion and contraction of the radiator when hotter water goes through it.
bleeding the air out will help if there is vapor lock.. which traps the water. and will help the heaters runs better..
make sure that you have a bowl or something to catch water if any comes out… it will be pretty nasty..rusty and such and will stain carpets.
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plumber
Definitely air in the system! just like household hot/cold.shut off the faucet-BAM.you didn’t mention what type of radiators you have.old style cast iron vertical fin or baseboard! you need an hvac pro to install automatic bleeders.
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Any time you have a pressurized water line you have to have some place for the water to go after the flow of water stops.
This is what is causing the banging sound you are hearing.
All you need is a place for the presure to relive it self after a cycle, this will stop the banging. I promise.
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Contracor / Carpenter for 10 years and counting
Several possible reasons, (1) the water temp’ is too hot and partly flashing to steam (probably the boilers limit stat or, the overide stat need replacing) (2) the pump speed needs raising to move the water round the system faster.
If it’s creaking and groaning noises from under floorboards then it’s copper pipe expansion where the joists are cut too tight and the pipes rubbing, (joists need to be re-cut to let the pipes expand more
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What you are suffering from is called ‘pipe hammer’ it is where the central heating pipes in your house are moving about and this movement causes the pipes to shudder when you turn them off,nothing to worrie about at all.
I dont think its anything to do with air locks or air in the system.
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40 years qualified and times served plumber.
More than likly air in the system , need to bleed system of air.
start at top of house working your way to downstairs .Dont forget to turn off system while you do this , otherwise you could encourage air back into it when opening the air vents.
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All the above answers are wrong,the thermostat valves need to be replaced,make sure the new one’s have bi-directional flow.
The only other possible reason that this is happening is that you have had a new pump fitted,and its fitted the wrong way round.
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2 possible causes
1 the holes in the floor or wall are not big enough so that when the pipe expands due to the hot water entering the radiator its rubbing against the wall or floor , remedy widen the hole , although it may even be a problem beneath if theres a joist there
2 rad valve on wrong way round , older rad trvs have to be fitted in a certain way they have directional arrows on them , the easy way to find out is to switch on your heating and feel what end of the rad gets hot first then look at the trv and see what way the arrow is pointing , usually pointing towards the rad meaning its on the flow , remedy change trv for as said above a bi directional valve but that will meam some minor plumbing skills and a drain down of your system
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20 years corgi fitter