Before you replace the battery, make sure you have the required tools and hardware. Ideally, you need a screwdriver and a level. In addition, you should have appropriate batteries for your model. Follow these steps to replace batteries in a Lennox thermostat: Turn off your Lennox thermostat; Slide the housing of your thermostat up and off the.. 4 of my lennox comfortsense 5500 thermostats do not have "Heat" or "Heat/Cold" mode options. the system has 5 different HVAC Technician: David Bowden This model thermostat does not require batteries.
10 Steps on How to Fix Lennox Thermostat Step 1: Troubleshooting the Battery. The first step in fixing a Lennox thermostat is to check the battery. When a thermostat stops working correctly, it may indicate that the battery needs to be replaced. Remove the faceplate of the thermostat and replace the batteries if necessary. Step 2: Check for.. Low Battery Indicators. Lennox thermostats are equipped with low battery indicators that alert the user when the batteries are running low. The low battery indicator is displayed on the thermostat's screen, and it is recommended to replace the batteries as soon as possible to avoid any interruption in the thermostat's operation.