Harman p68 ringing noise

[Bespin]

Hello,
I'm hoping someone can help me with an issue I'm having with my Harman p68. I purchased the stove new in 2022, so I'm going into my third season of use. I absolutely love the stove and it's performance. However, I can't lower the distribution blower without the stove making a rather high pitch ringing sound. It doesn't make the sound when the blower is in the highest position, and it still occurs even when I give it a good cleaning. It's really quite irritating and it would be nice to be able to lower the stove so it's not running wide open constantly, and to make it more enjoyable to sit near and enjoy something I spent about 8 years desiring to obtain, not to mention the cost of the stove. I provided a link to a video that I uploaded to YouTube so it can be seen what exactly I'm trying to describe. Really hoping someone can help.

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[rickwai]

motor will probably need replaced

 

[Washed-Up]

Try a few drops of 3in1 oil on the bearing caps

 

[Golfeur]

it's not a bearing sound
the motor is made to run at 120 volts and when you lower the speed with the potentiometer you lower the voltage so the motor does not run at 120 volts but a lower voltage.
The sound comes from the wire winding in the motor

 

[Washed-Up]

Well if you’re positive on the diagnosis then a new motor is in order. Just saw that you’re in PQ…great memories for me when I lived there for a couple years…keep us posted

 

[Bespin]

it's not a bearing sound
the motor is made to run at 120 volts and when you lower the speed with the potentiometer you lower the voltage so the motor does not run at 120 volts but a lower voltage.
The sound comes from the wire winding in the motor

Thanks for replying. So is this a defect in the way my motor was wound? Or is this how the p68 distribution blower sounds when lowered? Does your stove do this as well? Cause for the price of the stove it should have been engineered better.

 

[Golfeur]

even with a new engine it can do the same thing it depends on the manufacturing quality of the engine.
Washed up we can get out of Quebec but we can't get Quebec out of us.
it makes me proud that you have kept good memories

 

[Washed-Up]

Merci Mon homme…if the same frequency is coming from a new motor, I’d say the fan is not balanced properly

 

[Bespin]

even with a new engine it can do the same thing it depends on the manufacturing quality of the engine.
Washed up we can get out of Quebec but we can't get Quebec out of us.
it makes me proud that you have kept good memories

Does your distribution blower make the same noise, should I try a new one?

 

[Bespin]

Merci Mon homme…if the same frequency is coming from a new motor, I’d say the fan is not balanced properly

I'm not an engineer or anything. So what does that mean the fan is not balanced properly?

 

[Ssyko]

The way electric motors are designed is to operate at a specific voltage and frquency. 120/60 hz. When a potentiometer is used to lower the speed. It puts undue stress on the magnetic field in the windings and will make a noise similar to a bearing squealing. If it was not designed to work in the parameters the manufacturer required they will make noise. If it was not changed I would pull the motor and give it an oiling just to rule out that possibility. Now the question is has the motor been changed?

 

[Dataman]

I got my Harmon XXV in Spring 2018. When I used it I would get noise. Thought it was Distribution Blower (Have new one sitting). When we removed it found 2 screws rubbing on frame of blower. Could not figure it out without removing blower. It's tons quieter now.

 

[Washed-Up]

I'm not an engineer or anything. So what does that mean the fan is not balanced properly?

If there is dust build up on some of the fan blades it may cause some noise as the weight will distributed unevenly.

 

[shtrdave]

It could be a bad motor, when they installed mine and fired it up it had a little noise, the guy said it shouldn't sound like that and said he would bring a new motor for it. I was up by is shop and picked one up and swapped it out and have not had an issue since. Combustion motors I am on my 4th one I believe in 12.5 years.