Lennox Thermostat Cannot Communicate with Smart Hub

A smart thermostat is meant to make controlling your home’s temperature easy and efficient. So when your Lennox thermostat stops communicating with the smart hub, it can be frustrating trying to figure out what’s going wrong.

This article will walk you through the common reasons for the communication breakdown and how to troubleshoot the issue.

Lennox iComfort Cannot Communicate with the Equipment

Lennox iComfort Cannot Communicate with the Equipment

Why Does My Lennox Thermostat Stop Communicating with the Smart Hub?

There are a few key reasons why your Lennox thermostat may lose its connection with the smart hub:

  • Outage or Glitch

A brief power outage or a small software glitch can disrupt communication between the thermostat and the hub. Rebooting your home’s WiFi router may resolve the problem.

  • Wrong Network

If the thermostat gets connected to the wrong home network, it won’t be able to talk to the hub. Double-check that both devices are linked to the same network.

  • HVAC Problem

An issue with your HVAC system can cause the transformer to stop sending power to the thermostat. Inspect your AC or heating system for any problems.

  • Broken Thermostat

If your thermostat is just old and worn out, it may need to be replaced. The average lifespan of a thermostat is about 10 years.

How to Troubleshoot Lennox iComfort Cannot Communicate with the Equipment?

If your Lennox thermostat won’t connect to the smart hub, try these troubleshooting steps:

Check the Batteries

  • Open the thermostat case and remove any old batteries.
  • Insert new batteries, checking that the + and – align properly.
  • Replace the thermostat cover and test if communication works now.

Inspect the Circuit Breaker

  • Go to your home’s circuit breaker and look for the one that controls the thermostat.
  • Check if the breaker has tripped and switch it firmly to the “On” position.
  • Try to connect the thermostat and hub again.

Examine HVAC Safety Features

  • For the AC system, check the safety float switch in the drain pan. A triggered switch cuts power.
  • For the furnace, inspect the high-limit switch. The tripped switch indicates overheating.
  • Reset safety features or call an HVAC technician if issues are found.

Update Software

  • Incompatible software versions can prevent communication.
  • Use the Lennox app to check and update thermostat software.
  • Also, update smart hub software if needed.

Factory Reset

  • Press and hold the blank screen to reset the thermostat.
  • Reconfigure the thermostat settings from scratch.
  • Pair it again with the smart hub.

Replace Thermostat

  • If troubleshooting steps don’t restore communication, the thermostat itself may be faulty.
  • Swap in a new thermostat and set up a connection with the hub.

Tips for Using Lennox Thermostat

Once you get your Lennox thermostat communicating again, keep it running smoothly with these usage tips:

Check Connectivity

  • Open the menu and look for a WiFi or signal strength icon to confirm the connection.
  • Try manually syncing the thermostat if connectivity seems weak.

Adjust Location

  • Avoid putting thermostats near heat sources like sunlight or appliances.
  • Install it about 5 feet high on an interior wall for accurate readings.

Update Settings

  • Program thermostats with your desired schedules and comfort preferences.
  • Adjust settings like temperature swing (variation) for efficiency.

Use Energy-Saving Modes

  • Enable Smart Away mode to automatically adjust the temperature when you’re gone.
  • Use Schedule IQ to optimize heating and cooling for comfort.

Clean Thermostat

  • Use a soft dry cloth to gently wipe the touchscreen and casing.
  • Avoid using cleaners and solvents which can damage.

Replace Batteries

  • Replace batteries once a year or when a low battery warning appears.
  • Always use new high-quality alkaline batteries.

Also Check:


Losing communication between your Lennox thermostat and smart hub can certainly be aggravating.

However, in most cases, the issue can be resolved through simple troubleshooting steps like checking the WiFi, batteries, and HVAC safety features.

Resetting or replacing the thermostat may be needed if it’s malfunctioning.

With a few connectivity and usage tips in mind, you can get back to enjoying the convenience of smart temperature control.