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It's been awhile since I've read this thread, but wyowanderer brought up a good point and I'd like to clarify Briant's comment.

If you see a capital "H" flashing several times in a row (without...

Thanks everyone. I have recently seen my furnace run in some other stages such as 59%, 78%, etc. I didn't do anything to change my thermostat. As pacnw pointed out, the furnace probably needed a...

Thanks for the info. They gave me a VisionPro 8000 (3 stage heat / 2 cool). I haven't even checked the installation settings for the thermostat. Is it possible something is setup wrong in the...

Probably my biggest frustration is with the installers, instead of the furnace itself. After doing some more internet research, it seems to be a common problem was this furnace. HVAC companies are...

Well, I figured out the answer to my own question. The vendor who installed my furnace did not set it up properly.

If your G71MPP furnace flashes a code starting with capital "H", then it is not...

I just had a new furnace installed (Lennox G71MPP) which is supposed to have variable stages, up to 60. However, after looking at the diagnostic code on the furnace, I've noticed only the following...