Honeywell Thermostat: TH5220 / TH6220
Re: Battery Replacement
BATTERY TYPE: The TH5220 & TH6220 FocusPro thermostats requires 2 AA batteries.
LOW BATTERIES: When the batteries get weak, the thermostat should flash "Replace Batteries".
BLANK SCREEN: A blank thermostat screen could be an indication of bad batteries.
BATTERY REPLACEMENT
HOW-TO VIDEO: An instructional video is available at www.ghacinc.com under the Service & Repair page's "Help Yourself" section.