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Old 06-04-2012, 07:34 AM   #1
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Need to check transformer in air handler. Don't know where it is.


Neither my A/C, nor my heat, nor my fan will turn on. Someone suggested I check, among other things, the transformer in the air handler. Nothing in the air handler looks to me like the pictures of transformers I've seen online. Can anyone tell me from the following pictures where the transformer might be? I obviously don't know anything about this stuff.





Thanks,
Greg

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Old 06-04-2012, 08:42 AM   #2
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Need to check transformer in air handler. Don't know where it is.


The transformer is the part that is attached to the top of the bracket that holds your control board. Check your main power switch to air handler, make sure door is back in place to make door switch, or no power to transformer.

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Old 06-04-2012, 10:10 AM   #3
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Need to check transformer in air handler. Don't know where it is.


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The transformer is the part that is attached to the top of the bracket that holds your control board. Check your main power switch to air handler, make sure door is back in place to make door switch, or no power to transformer.
Thanks, I thought that might be it. What I think is the main power switch is on. If I wanted to test the voltage of the transformer then do I need to keep the door switch pressed in order to keep power flowing to the transformer?
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Old 06-04-2012, 10:15 AM   #4
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Need to check transformer in air handler. Don't know where it is.


that is correct. You should see 24 volts at R and C on your control board terminals.
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Old 06-04-2012, 10:55 AM   #5
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Need to check transformer in air handler. Don't know where it is.


yellow is hot R and blue is common C..might want to wire tie those spagetti wires lot of air moving thru there causing wires to bouce around
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Old 06-04-2012, 08:20 PM   #6
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Need to check transformer in air handler. Don't know where it is.


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yellow is hot R and blue is common C..might want to wire tie those spagetti wires lot of air moving thru there causing wires to bouce around
I may give it a go, then. Thanks for all your help!
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Old 06-04-2012, 09:36 PM   #7
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Need to check transformer in air handler. Don't know where it is.


if nothing is working shut the toggle power on the side of the furnace.verify the coils on both sides of the TR on top of the fan shroud thereleaving it in place.disconnect the pairs of wires on both sides blue/yellow 24v and the two/blacks 115v leave them floating and ohm them out should have a resistance or dead short showing continuity....either shows 0.00 itis open need a new TR note VA rating on the old one...local Grainger has them 40/50VA typical if either coil is good the TR should be warm to the touch...

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Old 06-07-2012, 08:51 PM   #8
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Need to check transformer in air handler. Don't know where it is.


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if nothing is working shut the toggle power on the side of the furnace.verify the coils on both sides of the TR on top of the fan shroud thereleaving it in place.disconnect the pairs of wires on both sides blue/yellow 24v and the two/blacks 115v leave them floating and ohm them out should have a resistance or dead short showing continuity....either shows 0.00 itis open need a new TR note VA rating on the old one...local Grainger has them 40/50VA typical if either coil is good the TR should be warm to the touch...
This is getting complicated. I'll see what I can manage with a voltage meter. If I get stuck and have to ask more questions then I'll start a new thread specific to that. Thanks again guys for all your help!

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