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11 Mar 2019 Honeywell makes a large number of different thermostats, and if you want to replace the Honeywell thermostat battery, the procedure depends 24 Jul 2017 There are many models of Honeywell thermostats with different battery replacement instructions, but here's how to find out: First, go to the 3 Jul 2018 15 Mar 2019 For a nonprogrammable model, press the latch on the upper-right corner to release a special battery compartment. Replace the old Honeywell 26 Jun 2016 Operating. Manual. PRO 1000 Series. Non-Programmable Thermostat. 69-2798EFS-01 Your new Honeywell thermostat has been designed to give you many years of reliable service and . Replace batteries once a year, or when you will 26 Oct 2018 So, it is highly suggested that any person should first read the manual of any thermostat for the replacement of batteries. In some thermostats Your new wireless thermostat is pre-set for immediate use. See Remote Control Operating Manual for more information. 72 Battery replacement (thermostat).Honeywell 4000 series (Th4110D/ TH4210D) To remove and replace the batteries, pull at the bottom of the thermostat to remove it from the wallplate. Once removed, turn the thermostat over and insert 2 fresh AA batteries, and then reinstall the thermostat on the wallplate.