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Hey Buddy..First ..You need to confirm that air is blowing out strong as usual through out the house, A good clean filter, and if your boiler rad is above furnace and or Air conditioning coil are all checked and clean.
Can you do that?
Im back, give me a few min to check into it.
You mentioned that FURNACE KEEPS TRIPPING OUT ON BLOWER failure-limit switch open.??
Is this still a issue? cause you want a wiring diagram for fan to run on second stage, do you mean low speed when LP furnace stat is reached?
Here is how it's done
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