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Bill N

Redspa Rumbling Noise

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My hot tub is about 3 years old and has recently started to make an intermittent rumbling noise.  It happens whether the pump is running or not and regardless of the temperature setting but stops when the power is turned off.  It seems to come from near the filters, which is also where the power cable enters the casing.  The pumps are on the other side.  It seems quite difficult to get someone to come and fix it.  Anybody got any suggestions?

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Sounds like some air cavitation. See if you can follow a procedure to purge air from lines if your manufacturer has one. Do you have any leaks around the filter area or anywhere lines are accessible to inspect? You may have a crack in an airline that is intermittently flexing and allowing air into a filter line that works its way out of the lines until it happens again. Instead of trying to get a local repairman go to the manufacturer's site for their helpline. In my experience those techs really want to help diagnose and achieve fixes for obscure problems like that.

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Thanks for replying.  I can't find a manufacturer's helpline for Red Spa but I have found a leak coming from somewhere near the filters.  Further investigations ongoing.

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Turned out to be a dodgy speaker on the sound system and an intermittent fault on the PCB.  Thanks to Richard at The Tub Company and Ash at Spafix (North).

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