Make sure filters are clean check voltage bothsides of pressure switch should be 24 volts if not bad pressure switch or syphon loop plugged if ok check the roll out fusible link means heater over heated check gas pressure if that is bad or you might need a wind stack
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Make sure filters are clean check voltage bothsides of pressure switch should be 24 volts if not bad pressure switch or syphon loop plugged if ok check the roll out fusible link means heater over heated check gas pressure if that is bad or you might need a wind stack