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Was blower blowing when it shut down<
Next step will be to see if blower wheel and filter are both clean
Does limit show closed?
I am going to open to other experts who may be able to assist with better accuracy rather that just tell you to start changing parts which would be less than professional and a guess at best without doing some troubleshooting.Please wait to see if someone is available more familiar with your unit.Replying will send this back to my desk and delay the process of getting an answer to your question