A restart reloads the controller without intentionally starting a new installation. A partial reset removes device data while retaining the HVAC configuration. A factory reset clears the device more broadly, including configuration that must be re-entered correctly.

Those distinctions matter on a heat pump or other installation with equipment-specific settings. Clearing them casually can turn a connection problem into a commissioning problem.

Amazon’s thermostat reset guidance distinguishes the reset routes. I would save the equipment and wiring information before any reset that requires setup again, and make sure an authorised account holder can complete that setup.

Gently detach the thermostat faceplate from its wall plate using the supported removal method. Do not pull the mounted base from the wall or loosen conductors. Wait briefly as directed by the support instructions, then refit the faceplate squarely.

Avoid touching exposed connections and do not remove wiring while equipment is powered. If the base is loose, cracked or does not accept the faceplate properly, stop rather than forcing it.

Allow the device to restart, then check the display and local controls before testing Alexa. This separates a controller that has recovered locally from a device still unreachable through the account or network.

A restart can clear a temporary unresponsive state. If the screen repeatedly goes blank or the problem returns whenever the equipment starts, investigate the underlying supply or installation instead of treating repeated restarts as maintenance.

Amazon’s partial reset is intended to preserve HVAC configuration while clearing other thermostat data. Its documented entry combination uses the Up Temperature and middle Mode buttons together for ten seconds until the reset indication appears, followed by the specified Mode confirmation.

Do not substitute the three-button factory-reset combination if you intend to retain equipment configuration. Check the current instructions before confirming, especially if the screen does not show the expected reset indication.

Afterward, complete the required account and connection setup. Preserving equipment configuration does not mean every schedule, device association or preference is preserved. Record what matters beforehand rather than assuming the word partial means nothing important changes.

For the documented full reset, hold Up Temperature, Down Temperature and Mode together for ten seconds until rEs appears. Then hold Mode for five seconds to confirm the reset.

This sequence is for Amazon Smart Thermostat, not a universal Honeywell or Resideo procedure. If the expected display does not appear, stop and confirm the product and instructions rather than repeatedly trying unrelated combinations.

Be prepared to set up the device again in the supported Alexa process and correctly specify the HVAC system. Record the original equipment configuration before clearing it, particularly for heat pumps and auxiliary heat.

If you do not know the system type or previous settings, ask the installer or support to help before resetting. Guessing the configuration afterward can produce incorrect heating or cooling behaviour.

Check local temperature control, the selected mode and the app’s current device status. Test only equipment functions appropriate for the conditions and allow normal protection delays. Restore a sensible schedule and remove any unintended hold.

If the thermostat is still unresponsive after the appropriate supported reset, gather the displayed state, model information and previous steps for support. Do not bypass the thermostat by bridging unknown terminals or change wiring as an experiment.

My recommendation is to start with a restart for a temporary freeze, use a configuration-preserving route when appropriate, and reserve factory reset for a deliberate new setup. That approach protects a working HVAC configuration while you solve the actual problem.