I've recently installed a new Pentair Mastertemp 200 heater. The blower motor has an intermittent high-pitched whine. I know it's not the "flame too rich" problem the troubleshooting guide mentions because it occurs even when the burner cycles off and/or when I turn the gas supply valve completely off.
I saw one post in the archives about this problem but nothing about the fix. Does anyone have any further information?
It's still under warranty, but I wanted to get as much info as possible prior to calling Pentair.