Older Carrier HVAC

[papollonia]

Hey guys:

I love this forum.

It has saved me ton of money..

and I love to work on stuff and learn..

Well I have older carrier unit,, 1993ish.

I posted a few months and was given help on replacing the start cap, which I did and the unit has worked great.

The current problem is a humming noise.

The fan blower goes on the unit never fires up.

I took the cover off and used a tube and one of the relay boxes is humming, it sounds like it is trying to connect but can not..

I took a picture and labeled which one was making noise..

Is this hard to replace?

Do I need to replace it?

Were does the common man, non HVAC tech get parts?

Thanks so much..

Paul

[Bobice]

Check the low voltage to the coil. These will usually come from the transformer. 24V. is what you need

[papollonia]

Thank you so much for replng..

I have a real Novice question:

What color would that wire be that I need to test?

Where is the coil / Transformer?

Is it right in front of my eyes and I am not seeing it!!! 

Thanks..

[Cactus Bob]

dont do anything if you are just hearing a noise . this is the reversing valve relay . it might make a noise as it gets older , this is normal .  are you getting cold air when you should be getting heat ? if i understand your post somethings not turning on ?  the relays shown have nothing to do with something not turning on , only if the system will blow heat or ac WHEN TURNED ON AND RUNNING

[papollonia]

Thanks for replying...

' are you getting cold air when you should be getting heat ? if i understand your post somethings not turning on ? '

Yes getting Cold air when heat should be on...

Any ideas what it could be?

The only noise i hear is from that relay I pointed to in my picture... It just humms, maybe sounds more like clicking...

What can I do to help us figure this out???

Thanks