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Replacement part for Lennox 51M27 9815 iLX Thermostat

ramsfan

Premium Member
Joined
Dec 4, 2017
Messages
13
Location
Saint Louis, MO
Model Number
51M27 9815iX
Brand
-major brand-
Age
More than 10 years
Hello, our thermostat was dealing for a year and has finally crapped out. The home we are in was built in 2004, and has a really nice Lennox two stage HVAC furnace/AC with humidity sensors. Fortunately, we have two units, and the upstairs thermostat has failed.

The thermostat that is in place is a Lennox 51M27 9815 iLX. I searched and it appears this item is no longer made. Does anyone know if the 51M28 is a valid replacement, or any other suggestions?

I am somewhat handy, but not an expert, so I would prefer to try as much of a "like for like" swap as a first pass.

Thank you

Carl
 

ramsfan

Premium Member
Joined
Dec 4, 2017
Messages
13
Location
Saint Louis, MO
I did a few hours more research, and I have determined the M28 is NOT a good replacement for the M27, as it appears that Lennox created a line of thermostats, the SignatureStat M26/M27/M28. The M26 was for 1 hot/1 cold, the M26 was for 2 hot/ 2 cold, and the M28 was for heat pump, so I can't use the M28.
 
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