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We have a 2019 3121RL and had same problem. Blower would come on for 30 to 60 seconds and then shut off. Furnace never ignited. Found out it was the sail switch. Dealer took it out, bent the metal flap a bit and put it back in. Worked for 24 hrs, then wouldn’t ignite again. Went out myself and bent the flap a bit more and it’s been working so far (48 hrs). Dealer said when blower comes on, it pushes air against the sail switch, opening up the propane and allowing it to ignite. Hope this helps.
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