As of Jan 2022, the new model is T3700 and the pin locations are now different than the original, so the new baseplate will need to be installed so that the wiring and pins match up correctly. It is no longer possible to just pull the front of the thermostat off and replace it while leaving the baseplate wired to the wall. Only compatible with 2-wire remote sensors, NOT the 3-wire RS+5/RS1/RSGND versions.
thermostat. 35° to 99°F setpoint range, 1-day program
with 4 time periods, Thermoglow™ display, back-lit color
coded keys and legends, Auto/Manual change over, accepts EZ-programmer
and IR remote, aux. heat indicator, UV lamp service indicator,
NEVERLOST™ memory, Outdoor sensor ready, 1-year limited