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Hi, I'm Tim and I'm an HVAC expert here to help answer your question(s). Please provide all the information I ask for since I'm not onsite. At the end of our dialog you will be asked to rate my service, but please wait until then and all your question(s) have been answered satisfactorily. Thanks for your business!
Have you tried cleaning the flame sensor?
Please look up the flash code you are getting on your furnace and tell me exactly what it says for that code?