New Aprilaire 760 Problem

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Old 03-16-15, 09:44 AM
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New Aprilaire 760 Problem

Have the subject humidifier where the fan doesn't run. When the humidistat is set to max, water flows but the fan doesn't run. There is a loud buzzing noise coming from within the case. I might venture a guess that is a rapidly engaging and disengaging relay, but I'm not sure. The fan motor was replaced recently. Any suggestions?
 
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Old 03-16-15, 10:02 AM
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Welcome to the forums.

You mentioned new.... what's new.... the entire unit ?

That unit has a relay and a transformer in it so either one can cause a buzz but the relay would be louder. What humidistat are you using ..... manual or automatic ?

There should be two wires coming out of the humidifier and heading to the humidistat. Short them together and see if the buzz stops and the unit operates normally.
 
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