What should I do if the thermostat is displaying a red battery symbol, “Low Batts”, or “Chg Batts”?

What should I do if the thermostat is displaying a red battery symbol, “Low Batts”, or “Chg Batts”?

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Honeywell Thermostat Low Battery Symptoms And How to Replace

, burner circuit: 24V 60 Hz, high limit range: 180 to 240F, with heat conductive compound, less well; replaces L8148E 1166, L8148E 1182 and

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Thermostat does not work even with new batteries. Honeywell

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My Thermostat kept indicating low battery even after I reset it to

Honeywell Thermostat Low Battery Symptoms And How to Replace