Emerson Thermostat Not Working After Battery Change: How to Troubleshoot

Replacing the batteries in your thermostat is necessary for a continuous, reliable operation. However, the reverse may be the case sometimes—the thermostat may stop working after replacing the batteries.

If that sounds like what you’re experiencing with your Emerson Thermostat, keep reading to see how to go about this issue.

Emerson Thermostat

If your Emerson Thermostat stops working after replacing the batteries, you might have installed the new batteries incorrectly, or used the wrong battery type. Mixing old batteries with new ones and corrosion in your battery terminals could also be the problem.

That said, keep reading to see how to solve this problem.

Tips to Troubleshoot Your Emerson Thermostat that Stops Working After Battery Change

So here are some troubleshooting steps to try:

Remove and Reinstall the Batteries

If you’ve just replaced the batteries on your Emerson Thermostat, but the device won’t turn on, you might have installed the batteries incorrectly.

Remove the batteries from the thermostat and reinstall them. Ensure you follow the correct polarity markings (+/-).

Also, check that your battery terminals are not corroded. You can use a soft cloth to clean the battery terminals before reinserting the batteries.

If the problem persists, continue to the next step.

Check that You’ve Inserted the Correct Battery Type in the Thermostat

Your Emerson thermostat uses alkaline batteries only. So, if you insert any other battery type (lithium/rechargeable battery) into the thermostat, the device may not work.

If your thermostat isn’t working after you’ve changed the batteries, check whether the new batteries are AA alkaline batteries. To do this, find the battery pack for your new batteries. If the batteries are AA alkaline, you should see AA alkaline somewhere on the battery pack.

If you don’t see the AA alkaline tag, you might have inserted the wrong battery type into the thermostat. In that case, remove the batteries and get new AA batteries.

However, if you confirm that you’re using AA alkaline batteries, yet your Emerson thermostat isn’t working, try the next tip.

Replace All Old Batteries

Another reason your Emerson thermostat might not work after a battery change is if you don’t replace all the old batteries.

While changing your batteries, perhaps you thought one of the old batteries still looked new. So, you changed only one battery and left the other in the compartment.

You should avoid mixing new batteries with old ones as this could cause some malfunctions in the thermostat.

Your Emerson thermostat may not work if you mix an old battery with a new one.

If this is the case, remove all the batteries and install a fresh pair of alkaline batteries.

Your thermostat should start working once you’ve replaced all the old batteries. If the device doesn’t work after this, try the next tip.

Reset Your Thermostat

If your Emerson thermostat fails to work after you’ve tried all the tips above, the device might be faulty.

In that case, you’ll need to reset the device.

Follow these steps to reset your Emerson thermostat:

  • Go to your circuit breaker box and turn off the breaker for your Emerson Thermostat.
  • Next, wait 5 minutes.
  • Now, turn the breaker back on. This should reset the thermostat.

If your thermostat still malfunctions after resetting it, contact Emerson Support.

Wrapping Up

If your Emerson thermostat isn’t working after a battery change, check that you’ve inserted the correct battery type in the thermostat. Then replace all old batteries.

If these tips don’t work, ensure that you’ve inserted the batteries in the correct order. You can also try factory resetting the thermostat.

But if your Emerson thermostat fails to work after you’ve tried all the tips above, reset the device. Contact Emerson Support if your thermostat doesn’t work after the reset.

You may also like to see how to troubleshoot:

Honeywell thermostat blank screen issues.

Nest thermostat heating problems.