Heller Reflow Oven Fan Noise

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We acquired a Heller 1809 MKIII and the fan on the bottom si... - Dec 09, 2024 by pdieng

I would contact Heller on the same. Their support has been p... - Dec 10, 2024 by kumarb

I would suggest checking if the fan is balanced correctly, c... - Dec 20, 2024 by jpsmyth

pdieng

#91658

Heller Reflow Oven Fan Noise | 9 December, 2024

We acquired a Heller 1809 MKIII and the fan on the bottom side of zone one makes a high pitched hum while the oven is at room temp. Once the oven starts to heat up, the noise goes away.

The bearings were in bad shape, so we replaced those but it didn't fix the problem.

We have found that if we lower the fan slightly, the noise goes away too but cant find anything that is interfering with the fan.

Does anyone have any ideas?

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kumarb

#91661

Heller Reflow Oven Fan Noise | 10 December, 2024

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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jpsmyth

#91678

Heller Reflow Oven Fan Noise | 20 December, 2024

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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