Heller Reflow Oven Fan Noise

I would contact Heller on the same. Their support has been pretty good when we ran into some rough patches on getting our new but idle oven operational. Running well now. From your details, perhaps the noisy blower motor needs to be replaced? Varying with the warranty of this machine, the blower motor may be covered by a lifetime warranty. Not sure if the warranty is with the machine or only to the original owner of the oven. Regardless, you should be able to disconnect this blower motor to test if it is the source of the noise or not. No harm if using the 'Wake up profile' which does not activate the heaters.

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I would suggest checking if the fan is balanced correctly, contamination, damage/wear also physical damage of the impellor blades will show themselves as the fan spins up. If the fan hits the magic resonance frequency the imbalance will multiply and this in turn will produce all sorts of issues such as noise, premature bearing failure, vibration.

On the electrical side have you had the fan windings checked to see if the there is a resistance issue? Final suggestion check the fan is being supplied the correct voltage and there is no issue with the supply.

Hope that helps.

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@slope game Since replacing the bearings didn't help, I recommend checking the fan alignment and ensuring it's securely mounted, as misalignments can cause vibrations. Additionally, consider adding dampening materials around the fan housing to absorb noise and double-check for any hidden obstructions. If the issue persists, replacing the fan might be the best solution.

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I probably should have updated a little sooner but it appears that it is just the metal enclosure vibrating on the particular zone. After playing with the one zone, I was able to get it to quiet down but then I heard another zone making the same sound and then the original one started making the noise again. I found that when I ran the wake up profile, opened the oven, and press down slightly on the zone, it would stop the sound. I don't know how to fix it long term but as far as I can tell, it isn't effecting performance and it stops making the noise when it starts getting warm. For now, I will be over looking this issue unless someone knows what causes this. Thanks for all the input!

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