Either I’m not understanding what I have or possibly the previous installer cheaped out.
Here is the wiring of the old thermostat:
Note the black and white wires on Aux/E (I have heat pump unit outside)
(Limited to one picture per post so I’ll add air handler diagram + wyze wiring in replies)
When I run through the self test, I get heat on stage 1, nothing on stage 2. I do have a heat pump, I do not have a heat pack/emergency heat. I suspect I have two stage based on wires available and the circuit diagram.
Background: As part of the deal to buy the house, they replace the HVAC units. I think they saved a buck by not replacing the thermostat, thus black and white were both connected to W1. Based on this theory and the fact that the thermostat’s terminals do not support more than one wire I put black in W2.
I’m looking at the manufacturer’s installation PDF ( https://www.lennox.com/lib/legacy-res/pdfs/installation_maintenance/lennox_cbx25_iom.pdf ) and that’s making it worse because from what I think I have, cooling with heat pump, is not described there.
Any help would be much appreciated, thanks in advance!