To replace the batteries in a Honeywell thermostat, gently pull the front faceplate straight off its wall mounting plate. Look at the back of the faceplate to locate the battery compartment holding two AA or AAA alkaline batteries. Remove the old batteries, insert fresh ones observing proper positive and negative alignment, and snap the faceplate firmly back onto the wall mount. Verification: Confirm that the screen turns back on and displays the proper home interface immediately.
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