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Pipes rattle when central air is turned on - Water Heaters

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There are only two pipes, liquid and vapor return. IF you are getting a rattle from those, then the issue is probably low freon.

Posted on Jul 18, 2013

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Posted on Jan 02, 2017

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Saunier Duval ISOFAST F35E on hot water only makes a noise like a motor bike that vibrates through the pipework, this does not happen when the central heating is on, any ideas as to the cause.


The water pipes (steel) are probably full of rust. The noise is air in the pipes.
Use the pressure relief valve to let air escape.
The risk is if the relief valve is old it may not shut off.
Also air will build up again

Nov 05, 2014 | Water Heaters

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Random banging and whooshing sound


New water heater?
http://waterheatertimer.org/New-water-heater-making-noise.html
http://waterheatertimer.org/Repair-water-heater-valve.html
Water does not compress. So each faucet has air chamber located behind wall. Air chamber is usually just a vertical piece of pipe about 18" long with a cap so it never fills with water. When water flows... all the water back to the main supply begins to move toward the faucet. The weight of this water can be considerable. When faucet is turned off, the whole column of water suddenly stops, but weight of water is still pushing forward.
Without air chambers to cushion the sudden stop of water weight, the pipes bang and rattle. With air chambers, the weight of the water pushes up into the air chamber causing the air to compress, which silently cushions the weight of water, but also causes a push-back when water stops moving forward. The push back can then move water backwards where it compresses air inside another air chamber. So the water can slosh back and forth.
IF you have factory-installed heat traps on your water heater, these things have rubber baffles. The baffles hum and rattle and whistle and clog and cause strange sounds that carry through the pipes and water heater and wood joists etc. The water sloshing back and forth can move the baffles and cause noise.
Or maybe you have a check valve that has gotten loose.
Post question on pro water heater forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/
Add a comment and say what you discover

May 17, 2013 | Water Heaters

1 Answer

When i turn on the hot water tap the boiler starts to bang and rattle. doesnt do it with just the central heating on. please help


first check for loose pipes the you might want to add a damper on the pipe to absorb the hammering just t in a piece of pipe and make it go higher than the pipe with the noise and put a cap on topp of that

Mar 27, 2012 | Water Heaters

1 Answer

Rattling AFTER water use, while heating


1) Rattling or clunking sound in pipes when water is shut off can be caused by lack of air chamber at the faucet. When moving water is suddenly stopped by faucet turning off, the forward energy of water suddenly stopping will cause pipes to shake. This is because water cannot be compressed. To stop this problem, each faucet has air chamber connected to pipes behind the wall. The air chamber is a simple pipe sticking up with a cap on it. The air chamber never fills with water, so a 'pocket' of air is contained inside the pipe. When water shuts off, the forward motion of water moves up the air chamber where it compresses the air which absorbs the energy, so pipes don't rattle or clunk.
http://www.crsupport.us/images/7b_build_const.jpg

2) Gurgling, popping sound inside tank is caused by sediment build up.
http://waterheatertimer.org/How-to-clean-sediment-out-of-water-heater.html

3) Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on plumbing or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 28, 2011 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

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Boiler fires up for 15 secs and then drops off. pcb has been changed twice, heat exchanger changed rads flushed. boiler is 2years old


Check that the overheat thermostat is working [i.e. the wires are connected] - If in doubt connect the terminals together to bypass.
Check that the air extractor fan is working and that the coaxial pipes have no gaps.
Check the air sensor plastic tubes to the fan are connected and intact
Check the central heating valves below the boiler and not turned off

Mar 13, 2010 | Long Life Water Heaters

1 Answer

I have an older model Ideal Mexico 2 floor standing open flue boiler running a fully pumped system. The central heating isn't working properly despite being flushed etc. The initial problem is still there...


You could undone the return at the boiler to release any air ? if you think there is a air lock . Or turn the pump up to max with the heating on and try to push the air out .


Jun 08, 2017 | Water Heaters

2 Answers

No central heating back boiler


back boiler run from a gas fire? check the instructions to operate the gas heat to the back boiler not just the fire
I presume that this a fully pumped system - air lock doubtful There maybe on/off valves on the pipes to and from the back boiler [situate close to cylinder] make sure they are on - anticlockwise turn
or there could be a blockage in the outlet from header tank usually in the loft. or If there is no water in it maybe the mains cold feed it is off.
Note if no water in it DO NOT USE the back boiler

May 03, 2009 | Bosch & Power Vent Water Heater

1 Answer

Have a rheem central air conditioner heater. I


gas valve could be clogged it has a screen in the side of the inlet, check this first if not it could be the gas valve itself,, make sure the gas valve is turned on also, sometimes people turn them off and for get the handle should be in line with the pipe not across the pipe

Apr 27, 2009 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

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