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variable speed blower

1002 Views 8 Replies 5 Participants Last post by  beenthere
blower does not work at all ? HELP PLEASE Wife is about to go to a
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Got a meter, and know how to use it?
i know how to use a meter
Well, I'm pretty sure you need to check for power to the unit in question with the meter, though I'm not in HVAC. A pro should be along shortly or for sure; in the morning. Please keep in mind our forum rules found at page bottom under "Privacy statement" or "Terms...."

Sorry I couldn't help you more. Gary
You can also try the white "search" box at the top of every page, eg.;

Click on my link for titles, hold mouse cursor over title to pre-read a little...

it is getting power ...i narrowed it down to ECM or circuit board but not sure of the order in which they kick in?
it is a AMANA Furnace...model # guva 070bx40
I believe you should check if this model is available with a separate motor and end casing. Not all are available as separate components which would then mean the diagnosis of one or the other is a moot point. You are now in Pro territory....
You said that the motor was OK but

Did the motor turn easily enough? Ball bearings OK?
Ohm each motor winding to the case for OL.
Olm each winding to each other. Should measure within 5 to 20 olms and within 10% of each other.
If all is OK, the motor is probably OK.

After unplugging the 120V motor supply and letting it drain for 5 minutes so you don't get shocked, unbolt the end casing.
Does the motor spin differently when the motor is plugged into the end casing as opposed to when its unplugged from it? If so the end casing has a short and is shot.
The only repairable part within that I know of would be the thermistor if it looks burnt, disconnected or swollen. That can be ordered from an electronics supply house or tracked down through Google and soldered in to replace the old one.. It will be a 1 olm 20 Amp or a 1 olm 30 amp depending on the size of the motor. The OEM's don't help here with thermistors. Beyond that, its ordering a new identical end housing if it's available, and for big $$$.
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