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We just bought a townhome and every time we use the LG Front loading washing machine there is a loud bang throughout the pipe system. I checked the back and there are already 2 water hammer arrestors (Size AA) installed on the inlet to the washing machine's hot and colt water intakes. When I checked the water pressure of the cold water it was at 80psi. Does the banging have something to do with the water pressure or could I need bigger Water Hammer Arrestors? We are on a municipal water supply.

Tester101
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Larry L
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3 Answers3

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You may need to replace the arrestors.. they do fail eventually. Also even with them in place there may be poorly secured pipes that bang around. Try to find them and secure them properly.

mfarver
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You could try swapping the inlet hoses for longer ones. The theory would be that the longer rubber hoses might absorb some of the shock (by expanding slightly) as the valves close. If possible grab some 6 foot ones or similar and curl them around behind the machine.

Brett Grubb
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Temporarily reduce the inlet pressure slightly by turning down the main inlet facet and see if the hammer goes away.

hookenz
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