I have a totaline P474-1050 stat, Lennox cb29m-51-1p FAU, and a lennox HP 26-042-7P heat pump. It was working fine and one morning it stopped. There is a white wire hanging free in the FAU that looks like it should be connected. My wire path goes like this:
STAT FAU HP
R red R red R
G green G Green only connects stat to fau
Y1 ------- yellow------ Y1 passes through FAU to HP
W1 -------blue -------- O passes through FAU to HP
W2 white White from stat hangs free in FAU looks like it should connect
C Brown C brown C
W1 white W1 white from HP to FAU

We had a small earthquake ( I didn't feel it) that could have knocked a wirer loose, so I am curious if the white wire from the stat to the FAu should be connected to something.

The totaline stat has these connections,
G=fan
Y1 = cooling
W1= ,O/B heating and reversing valve
R= power
C= common
Y2= 2nd stage cooling
W2= 2nd stage heating

there is hand written markings on the fan drum schematic: white= W2, blue = reversing valve, brown = common

Guess I`ve not been around long enough,, what is a FAU?

Forced air unit, the air handler

AH is the accepted term.

See page 21 figure 15

This is a copy of your factory AH manual

http://www.hvacpartsshop.com/CB29M%20Series.pdf


THis is a copy I believe for your outdoor manual.

http://www.hvacpartsshop.com/HP29%20Series.pdf

Keep a copy of these on your computer for future use.

With these two manuals and the wiring diagrams you should be able to figure it out.

My stat does not have the O connection. I believe that the W1 is being used for this purpose as it goes directly to the HP O terminal. I am not sure if my unit has electric heat or not. I did not install it. When I turn it on, the HP starts but nothing from the AH.

Thanks for the manuals. I have saved and printed both.