Quote:
Originally Posted by Rhyno
Thank you all for the help. Turned our the sail switch failed. Replaced it and all is good.
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Typically when a sail switch gets lint, animal hair, etc caught on the outside of the switch body the internal contacts can’t make full contact. What occurs then is a bit of arcing across the contact points due to poor mating of the two surfaces.
Over period of time the faces of the contact points get pitted to the point they no longer can complete the 12 volt circuit.. hence furnace cycles 3 times and goes into lockout mode.. because the sail switch fails to complete the circuit
Here is a video I made a while back showing you what happens and also a few internal views of the contacts and such.. many folks try to spray contact cleaner, etc on the outside body of the switch to correct the issue
This May or may not work and even if it does the problem will return again ..you can’t get the contact points clean by spraying anything on the outside body of the switch
https://youtu.be/Neg5E0WemgY