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Follow up on noisy fan. I thought that I had resolved the problem by blowing out the dust. The noise came back. I found a fix on Youtube that appears to be working. I ws able lubricate the fan...

Before I fired up the control box I removed the power supply and blew it out with compressed air. There was some dust but not much. Put the power supply back in, turned it on, nice and quiet. ...

Now I know why I couldn't find one. I think I've narrowed it don to the power supply. It's not easy to check because it only hums from a cold start. If I turn it off and restart it will not hum. ...

Thank you, MogulTx for a thorough explanation. I'll let you know what I find.

Phil

I didn't realize you were talking about the fan in the power supply. I'll check it out.

Thanks,

Phil

MogulTx. I don't know what a contactor looks like, where it is or how to find it. I'd appreciate a little more information.

Thanks,

Phil

It wasn't the fan. The fan wasn't even connected. What else might be making the hum on start up? It only hums for less than a minute.

Phil

Thanks, Jerry. I'll check it out.

Phil

I have a PRT 4g circa 2006. Lately, when I turn it on I hear a hum or buzzing coming from the box. If I give the box a light whack the hum will stop. Is this a sign of something I need to be...