on some of the units I have worked on, there is a metal thermocouple that sits in the pilot flame, if its in good condition and hot enuf current flows to open the main gas valve when thermostat calls for heat
these can break down to the point that they don't have enuf oomph to open the gas valve, replacing the thermocouple usually fixes it, look for small metal line coming from the gas valve with other end sitting in pilot flame, kinda delicate buggers, sometimes you have to take them out and match them up to find one that fits
on newer units, there is an electric eye that looks for blue flame of main burner but your unit looks lot older than that
natural gas leaks or malfunction can maybe blow a house up, please be careful
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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