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Posted by Ralph Mowery on June 8, 2008, 7:29 pm
> 25 to 30 year old forced air furnace with air conditioning. Last week
> discovered that during A/C usage, after several minutes the fan's
> electric motor would stop running. Sometimes accompanied by loud
> "bumping" noise.
>
> My first thoughts was the electronic thermostat, which was not the
> problem as the original (standard mercury analog) thermostat duplicated
> the problem for a test.
>
> The problem seems to be with a power relay that is controlled by one of
> the wires from the thermostat and a neutral wire. My guess is the
> contacts for the high current relay are burned out. Several years ago I
> measured the fan draw at about 10 or 11 amps. (borrowed a clip around amp
> meter.)
>
> -Is this relay a common DIY part readily available at a BORG, or does
> each maker of forced air furnace use a unique relay?
> -Is this relay sold only to Mechanical contractors?
> -Will I be on a hopeless search for finding a replacement part for a 30
> year old furnace?
>
> With the cost of gas for my car, I really cannot afford the cost of
> replacing the furnace and central A/C.
>
> Please help me NOT to buy a new Furnace right now.
>
> Phil
>
YOu may be able to go to a local store that sells air and furnace parts. I
had some bearings go out on an old furnace and took one by the parts store
and they sold me the bearings. It may help to have the part with you so
they can match it up with something that will work.
If they will not sell you one, then you should be able to go to a place that
repairs rurnace and go through them.
They may or may not charge you double the price of the part. That seems to
be the standard in some places.
Still beats the service call and the part.
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