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Have a 8531-III that was working just fine and stopped igniting. It starts the normal process, fan spins, but fails to ignite or even to try and ignite. Plenty of gas and all other appliances in rv work fine. Fuses for furnace are good and fuse in thermostat is good.
Hi, the first thing I'd suspect is the PC board if it just quit lighting all of a sudden but is still running. These are easy to remove and take to an RV shop to have tested to see if they're good. Could be a sail switch, hard to diagnose without being there of course... Try testing the board. Good luck.
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