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Changing batteries I Honeywell thermopro 3

How do I change the battery

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Any Honeywell thermostats I have come across you slightly tug on bottom of thermostat which disengages it from the wall and lift up. Batteries are then exposed. Replace with new and reverse take-off procedure to remount. If I remember correctly these do have a small battery backup to save your initial settings so you do not have to reset time and program. Can you tell me the complete model number of thermostat or send a picture of it?

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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Found this for you:

Insert the batteries backward, so that the negative pole lines up with the positive terminal. Leave the batteries placed backward for at least five seconds.

Remove the batteries and put them back in the correct way, then close the battery door. The display will turn on. The thermostat is now reset

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Remove thermostat from wall, leaving base plate on wall.
Model number appears on back of device.
Google search thermostat model in following format: Honeywell xxxx32 thermostat .pdf
Adding .pdf to search parameter will yield product manual.
Also while thermostat is off the wall, change batteries located in compartment on back of thermostat. These batteries must be changed periodically, for example each 3-4 years.

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The thermostat for the main zone in my house (honeywell model RTH5100B1017) is battery powered and it blinked change the battery for a couple of daye and then went blank. I have changed the batteries twice...


  • Check any batteries and replace if needed. Ensure that you use only AA alkaline, nonrechargeable batteries.
  • 2 Check for oxidation buildup on battery contacts. Use electrical contact cleaner and carefully clean the battery contacts of any oxidation buildup.
  • 3 Reset the system switch.


  • Read more: How to Troubleshoot Honeywell Thermostats ' eHow.com http://www.ehow.com/how_6596826_troubleshoot-honeywell-thermostats.html#ixzz17aWIl2Xt

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    Hello
    If the thermostat will not turn on and it has good batteries as back up to wall DC voltage then the conclusion is that the Thermostat has failed, these are considered throw away and are not serviced by Honeywell except under warranty and then they send out a new one and "thrash" the old one, so fixing it is not an option, you will need to just replace it, a good quality electronic programmable T-stat is less than $40.00.

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    remove batteries let sit a few minutes reinstall.
    if still bad replace they are not servicable

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