Propane smell and no heat

We are having a strong propane gas smell and no heat (at all) from dryer. Of course, we have stopped using dryer and ventilated the laundry room. It may have started to act up over the last week. We noticed an intermittent minor gas odor, but the dryer was still heating/ drying clothes earlier in week. I have a professional combustable gas detector and ruled out any gas line leak from dryer, furnace and water heater. How do I troubleshoot this to determine what is wrong with my Frigidare dryer? What part(s) do I need? Thanks!