Hmmm....as Im reading my new Thermostat manual Im wondering...
Our HVAC guy installed a White-Rodgers 1F80-224 Thermostat with our Amana Prestige 14 SEER and AMV8 Furnace.
Now, Im no expert - in fact I know nothing - but is seems this is a Single Stage Themo and the AMV8 is a 2 Stage/Var Furnace.
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Spec sheet on the AMV8 states:

Thermostats
A 2-stage thermostat should be used with the AMV8 furnace. A 2-stage thermostat controls which firing rate is used depending on the temperature difference between the set point and the room temperature. A properly used 2-stage thermostat and furnace will maintain a much tighter control of
temperature than a conventional single-stage thermostat and furnace. A 2-stage furnace has both W1 and W2 terminals. If the thermostat has Y1 and Y2 cooling connections and a single-stage cooling system is used, connect Y on the furnace control to Y1 on the thermostat. The table below
describes 2-stage thermostats which have been set up for use with this furnace.

Model Two-Stage Thermostat Description Color
1213411 Digital, Non-Programmable, 2-stage, 2 Heat/2 Cool White
1213407 Digital, Programmable, 2-stage, 2 Heat/1 Gool White
1213406* Programmable, 3-stage, Manual or Automatic Changeover Beige

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Also, the cover sheet of the Manual of the 1F80-224 Thermostat states:
DO NOT USE WITH (their caps, not mine):
Multi-stage Systems.


Do I have a mismatch here?? If so what model (W-R) Thermo should I replace with?

Thanks again!