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Need a little more info.
What happens when the fan is set to AUTO and furnace is selected?
IF it blows cold air for a few seconds and quits, most likely a sail switch.
Look in the files section and download the furnace troubleshooting manual.
Follow the troubleshooting steps based on the symptoms you are experiencing.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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