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So this dryer is wired a bit different than most dryers. The door switch is wired in line with the high limit thermostats below the dryer drum. You'll need to test continuity through the thermostats below the dryer drum and whatever thermostat has no continuity, replace it. Frigidaire wired it this way so that if the high limit thermostat goes bad, it stops the dryer from running but of course if gives a completely non-intuitive error telling you the door is open when it does occur. Also, these high limit thermostats tend to fail from a partially clogged vent so you'll want to make sure your vent through your house and dryer are clean.
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