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Old 08-03-2021, 02:25 AM   #1
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Atwood furnace sail switch testing

Hi All,
My Atwood furnace 8535-IV stopped igniting earlier in the year. I replaced the board but that was not hte issue. It starts the fan but the ignition cycle never starts, dont hear the clicks or any smell of gas. I took apart yesterday thinking maybe fluff on sail switch but it was fine. I took out sail switch and used a multimeter continuity test and I get continutity when the switch is enabled. There is some resistance but not sure how much is correct. I put it back in but still have the same issue. Is there something else I can check on the furnace, like where should I be checking power. I will check Im getting power to the sail switch next weekend but any other advice. Like should I just replace the sail switch anyway.

Thanks
Ken
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Old 08-03-2021, 04:11 AM   #2
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Don't know what the resistance should be but if you jump across the contacts of the sail switch (thereby bypassing the switch) and it still doesn't work, the sail switch is not the problem. Obviously, you don't want to leave it that way as a solution but it will work for testing.

If that does fix it, your next step is to clean all the corners on the inside curves of the slats of the squirrel cage. I have found that enough dirt can collect to slow down enough to be the problem. I have used a small bendable bottle brush to get into those corners.
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Old 08-03-2021, 04:17 AM   #3
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Maybe Old Biscuit will come to your rescue. Here is a thread that may help:


https://www.irv2.com/forums/f54/atwo...rt-427322.html
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