Pentair Heater - Intermittent Low Vibration

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B

bbdude

Gold Supporter
Jul 20, 2017
255
Buffalo, NY
Pool Size
28000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Hi All - 1 year old Pentair 400k gas heater. I am noticing every now and then our heater vibrates. Yesterday it was fine, today it vibrates. The vibration is low and you can hear it inside our house.

Changing pump speed doesn’t seem to make any difference. Any idea what might be the issue?

Here’s a video of the sound …

https://imgur.com/a/aYMSj5T
 
Pool company came and tested gas pressure and it was fine. They did not remove the thermal regulator, but suggested it could be a low flow issue since I'm running my pump at 1900. They suggested running it higher next time it occurs to see if it alleviates the humming.

Strangely, the issue hasn't occurred in the last month.
 
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