A loud buzzing is coming from our blower- the
This can be one of those jobs that fall under 'while I'm in there, I might as well do some spring cleaning and investigating'.
The noise that you're hearing could be a couple different issues ranging from safe to dangerous:
- something has been dropped into the 'squirrel cage' (fan), causing the noise as the motor turns the blower fan. Typically, if you have children, it's not hard to end up with a lego, piece of construction paper or other item being tossed into the blower. A playing card can end up sounding like a 'buzz' when lodged within the blower housing as the fan is turning at high RPMs.
- the contacts, as you've identified as the possible, may not be making a complete connection anymore, causing an electrical arc that subsequently can cause damage to the motor itself by limiting amps to the motor and FIRE with the presence of dust or other flammable debris.
To be on the safe side, cut power to the unit by flipping the breaker that it operates on at your breaker box (OFF), remove the blower by removing a few bolts and have it completely blown out of all dust and debris with an air compressor. This will lower the risk of malfunction, fire and costly replacement of motor later on. At this time, check the motor... specifically the copper coils and leads... for scorching and the internal brushes (contacts) for excessive wear.
Check all connections for singed areas, tell-tail burn marks that suggest arcing, surging or the presence of moisture within the unit. If anything related to the electrical system (wiring, contacts, connectors) appear to be worn or damaged, it would be best to hire an electrician to repair/replace what is necessary to ensure the safety and continued efficiency of the unit... and to get that valuable labor warranty if similar problems develop later.
As for pricing: it's very hard to say, considering we're not sure what type of unit we're referring to. If this is an internal home heating/cooling unit, most of the internal components are available for little cost at Lowes, Home Depot or any other home improvement warehouse or are able to be directly ordered from the manufacturer of the unit if the unit is not ancient (over 20 years old).
Good luck and be safe.
7/7/2009 6:18:46 PM •
Goodman...
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Answered
on Jul 07, 2009