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A 2 month old Goodman GMH95 natural gas furnace has been working properly until tonight. Now it starts up properly, but after 30 seconds (and right when the cirulator fan kicks on) it shuts the gas valve stopping the flame. LED light flashes 8 times, which is not an option on the trouble shooting guide. Unit will retry every few minutes and cycles this way over and over. It appears the control module is not receiving the gas flame detection signal. What do we need to do?
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