Question about Aprilaire 550 Humidifier

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Loud noise all of a sudden our humidifer is making a very loud vibration noise. At first we thought it was the furnace so we had tune-ups on the furnace and the also serviced the humidifer. It didn't make the noise while the techinican was here but is now getting more consistent in making the noise.

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  • joe7777 Nov 13, 2008

    I just changed the filter and now when the unit turns on and off it makes

    very loud noises from the water feed. Is there anything I could check to see

    if this could be resolved..Joe in Buffalo NY

  • buy789 Jan 14, 2009

    My 10 year old model 760 has started to make a vibration sound that travels through out my house. I figure I can repalce the whole unit, but would like to try and replace just the cause of the sound. I cleaned the fan blades and that seemed to work for about three weeks, but now the sound is back. Any ideas?

  • Anonymous Jan 16, 2009

    loud vibation sound echoes thru the whole house

  • buy789 May 11, 2010

    OK, I am going to try that and let this group know how I make out. Thanks!

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Replace the water valve... It"s vibrating when closing. Do you have hot water feeding the unit?

Posted on Jan 26, 2009

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1 Answer

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TLuzzo - The humidistat seems to be working when you turn it down. The wires for the solenoid should be hooked up to your furnace circuit board. The instruction manual will tell you where. If you dont have a spot on your circut board the A 50 sensing reley is they way to go. They are inexpensive

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sounds like either the motor is off balance
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