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Will fan or anything come on?
Do you have a volt meter for troubleshooting?
Ok our first step in troubleshooting is to verifiy we have 24 volts between C and W on board when calling for heat.Can you get the meter?
Very possible that either we are not getting 24v out of transformer or tstat could be bad, Try jumping the R and G wires on control board and see if fan will come on and R and W to see if heat will come on.That will tell us if thermostat is an issue.
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Is return pulled through the louered panel or from top of unit?
Can you attach a photo?
If you have a paper clip icon on your page you can attach using that link.Or
You can upload the pictures using the tiny pic site .
Here is a link to the site.
Click on Browse , select the file from your folder.then click UPLOAD NOW.
They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW
You will see your picture on right side of screen.
Then copy the link URL for email & IM
Paste that link here on the site.