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Sorry for the delay in response. The heater only makes the noise after the NG ignites and takes about 2 to 4 seconds afterwards to start whining. I think it's the thermal regulator. Still waiting on PB.

Hey guys, new user here. Had a "spool" (1400 gals) installed about a little over a month ago with a Jandy JXI400NK with integrated bypass valve installed and it started making this same noise: . The poster commented saying it was a bad valve and I assume that's the thermal regulator valve (TRV)...