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This just happened last night. Someone in my household used the upstairs toilet, and it clogged badly. When I got home last night I used the plunger for about an hour to try to clear the clog. I...

Labman and Flickit: thanks for the information and encouragement to proceed.

Eapples <;-)

Labman: thanks for the insight. The fault indicator on the control board indicates an open limit switch -- do you still think it's the fan relay? I was thinking of purchasing an ohmeter and/or a...

I've raised this issue in other forums. I have a high efficiency furnace that has worked flawlessly for the last four years (the house was built in 2000). This year we had to have the circuit board...