You guys seem good at solving mysteries.

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  #1  
Old 07-15-05, 10:22 AM
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You guys seem good at solving mysteries.

I have a Honeywell humidistat in a small apartment hallway (it serves a fan in the bathroom adjacent to the hall). Occasionally, when the humidistat turns the fan off, it makes a very loud noise in the hallway, very acoustic sounding. Hard to detect exactly where it's coming from, but I suspect it's from a hard wired smoke detector on the ceiling in the same hall. It seems to blip out some noise when the humidistat switches off. It's not coincidental. It's definitely related to the humidistat switching off. It's quite loud enough to make me jump a mile when it happens.

Any guesses to what causes this?
 
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Old 07-15-05, 10:44 AM
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Magnetic relays. The thermostat may be on a low voltage system which turns on the high voltage fan by way of a magnetic switch called a relay. The sound you hear is the magnet grabbing or releasing its internal switch lever.

Relays often have some sort of rubber or plastic sound protection which may have worn out over time allowing the metallic clicking to get louder. What you describe sounds really loud though. Relays aren't usually that loud, but perhaps its oversized or echoing just right.
 
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Old 07-15-05, 09:29 PM
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might also be the fan damper slamming shut
 
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Old 07-18-05, 12:30 PM
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Originally Posted by scott e.
might also be the fan damper slamming shut
Good idea!
 
  #5  
Old 07-18-05, 06:24 PM
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It's not the fan relay. But the magnetic thing might be it.
Very interesting stuff.

I'll replace it then.
THANKS!
KELLY
 
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