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-   -   blower fan not coming on (pics included) (http://www.diychatroom.com/f17/blower-fan-not-coming-pics-included-38403/)

TitanTn 02-15-2009 04:36 PM

blower fan not coming on (pics included)
 
3 Attachment(s)
My Goodman HVAC stopped blowing air today. From what I can tell, then system is firing just fine, but no blower. I assume that it could a relay. I accessed the wiring portion of the air handler, but I see what looks like two different relays. Pictures attached. Can anyone identify these parts? Since the relay is a cheap part, I figured that I'd replace it and see what happens. If there are any better ideas, please let me know. Otherwise, can anyone identify which of the items in the pictures is the blower relay?

Yoyizit 02-15-2009 05:27 PM

At rated current, for an electromechanical relay, less than 30mV across closed relay contacts is good and more than 100mV across closed relay contacts is bad.
Also check if the relay coil has sufficient voltage to pull in the armature.
If you post the numbers off the relay the coil voltage can be figured out.

Post a schematic, from power source to blower motor.

yuri 02-15-2009 08:10 PM

The bottom item looks like a circuit board which will have your fan relay built onto it. The other one is a sequencer for the element and the round thing is a limit control. The wiring diagram on the right of them above the transformer should help you also. Try turn your fan to ON from Auto at the tstat. It may be a bad motor or motor capacitor. Parts changing can be expensive.

TitanTn 02-15-2009 08:30 PM

Thanks for the help so far. So are you saying that the very small relay looking device on the circuit board is the fan relay, or the large item on the right that is wired to the circuit board is the fan relay? When I flip the switch from Auto to ON, there is no difference. So I just don't think the fan is getting power through the relay at all. From what I understand, I can get a relay for about $10-$20. That seems like it's cheap for the likely suspect. I know I can replace the relay if I buy one, but right now I'm not sure how to identify the relay and I'm certainly not sure about how to test one.

Yoyizit 02-15-2009 08:45 PM

Just make sure there is no root cause which made the relay fail. Otherwise the new one also becomes toast, assuming it is the relay.
If you have a voltmeter and a schematic we can more certainly nail down the cause. Open circuits are easier to troubleshoot than short circuits.

yuri 02-15-2009 08:47 PM

The large item with the rusty bracket is the main power transformer from 240 to 24 volts. The capacitor which is mounted on the fan housing may be the problem. Unless you are an electronics guy the relay on the board is not replaceable.

TitanTn 02-16-2009 08:48 PM

Quote:

Originally Posted by yuri (Post 230935)
The large item with the rusty bracket is the main power transformer from 240 to 24 volts. The capacitor which is mounted on the fan housing may be the problem. Unless you are an electronics guy the relay on the board is not replaceable.

So the relay is on the board? I've done several jobs of re-soldering devices on circuit boards. If that's what I need to do, I'm fine with it.


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