Here's what I've done so far... I learned the signals from the OEM remote and verified that I could correctly operate the fan with the learns. I then downloaded the remote into RMIR and discovered the learns were an unknown protocol (boo). So I decided to take a stab at making the protocol myself.
Here are the timings for the three signals (that's all the buttons on the remote...it's a fan after all):
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Power = +1266 -426 +1266 -426 +422 -1270 +1266 -426 +1266 -426 +422 -1270 +422 -1270 +422 -1270 +422 -1270 +422 -1270 +422 -1270 +1266 -7096
Speed = +1266 -428 +1266 -428 +422 -1272 +1266 -428 +1266 -428 +422 -1272 +422 -1272 +422 -1272 +422 -1272 +422 -1272 +1266 -428 +422 -7942
Timer = +1266 -428 +1266 -428 +422 -1272 +1266 -428 +1266 -428 +422 -1272 +422 -1272 +422 -1272 +1266 -428 +422 -1272 +422 -1272 +422 -7942
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Power = +1275 -425 +1275 -425 +425 -1275 +1275 -425 +1275 -425 +425 -1275 +425 -1275 +425 -1275 +425 -1275 +425 -1275 +425 -1275 +1275 -7100
Speed = +1275 -425 +1275 -425 +425 -1275 +1275 -425 +1275 -425 +425 -1275 +425 -1275 +425 -1275 +425 -1275 +425 -1275 +1275 -425 +425 -7950
Timer = +1275 -425 +1275 -425 +425 -1275 +1275 -425 +1275 -425 +425 -1275 +425 -1275 +425 -1275 +1275 -425 +425 -1275 +425 -1275 +425 -7950
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Zero = +425 -1275 = 1700us
One = +1275 -425 = 1700us
Power = 00011000 000 +1275 -7100
Speed = 00011000 001 +425 -7950
Timer = 00011000 100 +425 -7950
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Zero = +425 -1275 = 1700us
One = +1275 -425 = 1700us
LeadOut = -6675
Power = 00011000 0001 -6675
Speed = 00011000 0010 -6675
Timer = 00011000 1000 -6675
So I went to Protocol Builder and punched in all the stuff:

Here's the Protocol Code:
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Upgrade protocol 0 = 01 CD (S3C8+) Honeywell Fan (PB v4.02)
3D 92 11 8B 14 85 10 08 04 02 7D 00 C0 00 D4 02
69 0D 09 FF FF FF FF FF 01 8D 01 46
End

Aaaaaaaaaaaand...nothing. =( It doesn't work. I tried a lot of simple variations (e.g. complement yes/no). I also setup all OBCs from 1 to 15 and none of them had any impact on the fan whatsoever. =(
Unfortunately, I have no way to check the signals being sent by my upgrade. I (foolishly) did not order a second remote (to learn from the first with the upgrade) so I have no real way to diagnose/debug at this point. Anyone have any thoughts on this?
In addition to the information above, I've uploaded an IR image of the learns: https://www.hifi-remote.com/forums/dload ... e_id=11230
I've also uploaded an RMIR image with my attempted protocol/device upgrade that does not work (which also contains the learns): https://www.hifi-remote.com/forums/dload ... e_id=11231
Thanks in advance for any assistance.
Vyro