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Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a delay in my response.
Check the rollout thermostats around the burner housing one is likely tripped open. Some have reset buttons in the middle of them. You just need to press the button in and see if one clicks then try it.
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If you bypass it does it stay running? If so you may have a bad one or the unit could be overheating, due to too restrictive of a filter (HEPA) or you could have a blocked heat exchanger or possible condensate back up issue.