Rhythmic vibration and buzz from Harman 52i combustion fan

Peterfield Posted By Peterfield, Dec 3, 2018 at 9:58 PM

  1. Peterfield

    Peterfield
    Minister of Fire 2.
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    Dec 12, 2013
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    Hey all,

    This heating season, the combustion blower of my 2014 vintage Accentra 52i has developed a rhythmic vibration where every 10 second or so it will begin to give off a low pitched buzzing sound and then the sound will mostly fade away from 10-15 seconds. It’s getting so you can set your watch to it. This happens in test mode and also during startup and continues after pellet ignition. I’ve read up on older posts and it seems that I will be in the market for a new blower motor. I have a service call in for a cleaning and possible blower replacement but before he calls back, I am looking for recommendations of better third-party motors out there over the OEM blower. Thanks in advance.

    Paul
     
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  2. zrock

    zrock
    Feeling the Heat 2.
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    Dec 2, 2017
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    is it your motor or hopper lid? my hoper lid will vibrate when pellets get low to the point it scared my little one and she thought something was wrong and unplumbed the stove..
     
  3. rona

    rona
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    Apr 2, 2008
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    Harmans seem to have a habit of amplifying vibration noise through the metal guards in the back of stove. There was a individual who was selling combustion fans for 125.00 on E-Bay Is it possible the noise is coming from auger motor and it makes noise when stove is first started but after it is run for a hour or so the noise quits?
     
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  4. Peterfield

    Peterfield
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    The technician called and wants to do a thorough cleaning to include the blowers and see if that quiets things down. If not, then the third-party motors seem interesting.
     
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  5. Peterfield

    Peterfield
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    My hopper lid does have that vibration as well and if I press on the lid or shimmy the stove a bit, it stops. The fan however buzzes on.
     
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  6. bob bare

    bob bare
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    Oct 31, 2013
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    Wow.Do you pull your insert,and service it yourself?Your blower probably has bronze bushings,instead of bearings(for noise),and,companies that pull/clean and reinstall inserts do not lube the motors,as,the factory info does not prescribe this.There are many posts here about lubing bushing and bearing type motors,never advertised by the manufacturers,as they want to sell parts and service.Your motor is 4 years old,never had a drop of oil added,and,possibly not cleaned properly,I do not know what you are expecting.The blower motor is a wear item,same as brake pads.There are so many threads about lubing these motors is because we try to save us,and other posters,money.Service technicians do not use a needle to inject oil into sealed bearings,nor oil bushings.My advise is to tell the upcoming technician to bring a new blower motor with him/her,to install.And,if you really want a long lasting motor,it will be ball bearing(noisy)and very expensive.Sorry I ranted,but,I have seen this issue so many times.
     
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  7. Zeus

    Zeus
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    Mar 12, 2015
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    Earth sense has an oem combustion motor for$98 made by Gleason Avery
     
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  8. rona

    rona
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    I agree and will add that quality motors will use replaceable bearings if possible but in many instances when you hire a technician they will install a new motor and your problems should be over. If they did the same labor and oiled a bearing it would maybe last the season but next fall you would be calling him again and saying you didn't fix my problem. This is why a lot of owners do their own repair. But after taking a stove apart twice for oiling a bearing in one season we see that replacing that motor is often the smart move especially if that motor is tough to get at. Plus of course that motor will never fail when you have time to fix it or you have a spare on hand.
     
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  9. Peterfield

    Peterfield
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    We’re on the same page. I expect the blowers will need replacing and was just wondering if I should be looking at OEM or third party blowers. The technician has told me before that the bearings on these motors are sealed and can’t be lubricated. I think he just wants to double check and clean the fan blades to make sure it’s in balance.
     
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  10. Peterfield

    Peterfield
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    Any solutions for the vibration noise through the metal guards in the back of the stove?
     
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  11. Dataman

    Dataman
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    Sep 10, 2018
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    Yes. Red RTV Silicone where it's rubbing. I found 2 screws on my Distribution Fan (Harmon XXV) that were impacting the fan housing. You can also put block of something to hold pressure on the sheet metal. I did not need that after some RTV.
     
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  12. Peterfield

    Peterfield
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    Dec 12, 2013
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    Well, the technician came and deep-cleaned the stove and listened to the noise the combustion/exhaust blower was making. He admitted it was a little louder than normal and that replacing the blower is a b*tch of a job. It was late in the day and I got the distinct impression he just didn’t want to tackle the job. So, my question now is how difficult is it to do. From videos I see that sometimes the fan blade has to be cut off to allow for removal of the motor. I know I can call the dealer where I bought the stove from and they’ll do the job but is it an easy DIY operation or should I leave it the hands of the folks that have the tools and the talent?
     
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  13. Dataman

    Dataman
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