Testing a residential wall thermostat without removing its faceplate from the wall involves evaluating its response to manual temperature adjustments and observing the behavior of your HVAC system. First, turn the temperature setpoint up at least five degrees higher than the current room temperature in heating mode; you should hear a soft internal relay click within the thermostat, followed closely by your heating system turning on within a minute. Second, lower the setpoint below room temperature in cooling mode to verify that the air conditioner engages. If the thermostat clicks and displays a call for heat or cool, but the equipment fails to start, the issue lies in the wiring or HVAC unit rather than the thermostat. You can verify correct operation by confirming that the equipment responds accurately to your on-screen commands.
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