How to Fix Lennox icomfort Thermostat Blank Screen

A  blank screen  on a Lennox thermostat usually means that there is no power going to the thermostat or you have a failed thermostat. However it’s hard to conclude  the cause of this problem before any troubleshooting steps is performed to establish the root cause for this

In this troubleshooting guide, I have put together a few common possible reasons for a thermostat blank screen.

Possible Causes for a lennox thermostat blank screen

Possible CauseFix
No power going to the thermostatCheck circuit breakers and switches.
Lose wiringTighten an secure wires on thermostat
Thermostat not receiving power from transformerTest the ends of C and R  wires for continuity 
Failed  thermostatHave it replaced

Read also: Carrier Infinity Thermostat Blank Screen [Fixed]

Thermostat Not Receiving Power

If your thermostat  is not turning on at all, it’s possible that it  is not receiving power. This could be due to a problem with the wiring or with the transformer that supplies power to the thermostat. 

To diagnose this issue, you’ll need to check the wiring connections and test the voltage on the thermostat wires.

If there is no power coming through,  the transformer may be  faulty,and will need to be replaced by a professional.

Loose thermostat wiring

If the wiring to your iComfort thermostat is damaged or loose, it may not be receiving power properly, which can cause the screen to go blank.

Check the wiring connections to ensure they are tight and secure.

 If you notice loose wires or wires that are not properly connected to the terminal, secure them properly and it possible strip off the insulator on their  ends at least ⅓ inch to make sure they have contact with their respective terminals.

Read also: Lennox Thermostat Not Showing Outside Temperature [Solved]

Tripped float switch

If your air conditioning unit has a float switch installed, it’s designed to turn off the system in the event that the condensate drain line becomes clogged and the water level rises too high.

 Check near the indoor unit for a float switch in the drain and if you have one lift it to see if you’ll get power to the thermostat. 

If that drain gets partially clogged the float will kill power so it does not keep making water and ruin ceiling carpet or floor.

 As water seeps out, it will reset and allow the unit to come back on and run until water backs up again.

In other words, if the float switch is tripped, it will cut off power to the entire HVAC and prevent it from turning on. 

That could be the reason you have a blank screen on your thermostat. To fix this issue, you’ll need to clear the clog in the drain line and reset the float switch.

Read also: Ecobee Touch Screen Not Working [Fixed]

Failed Thermostat

Finally, if none of the above issues are the cause of the problem, it’s possible that the thermostat itself has failed. 

This can happen if the thermostat is old and. To determine if this is the case, you’ll need to test the thermostat using a multimeter. If the thermostat is not functioning properly, it will need to be replaced.

Read also: Trane thermostat blank screen fix


What should I do if my Lennox icomfort thermostat screen is still not working?

If your thermostat screen is not working after trying the tips provided in this guide, it’s perhaps a good idea to call support for help or for possible thermostat replacement. Alternatively you can call a local HVAC professional for help.

Thermostat has about a 5 year warrant so if you are still under warrant you will have it replaced.  But labor has to be paid for in whatever case.

How to reset a Lennox iComfort thermostat?

To manually reset your lenoxx thermostat, 

  1. Turn the furnace power off.
  2.  Turn the breakers back on. 
  3. Turn the furnace back on. 

Would resetting Lennox  thermostat reset fix the blank screen problem?

How do you  turn on lennox thermostat touch screen

To turn on your Lennox thermostat touch screen, Locate a button on the left side of your thermostat. Press and hold it for at least 5 seconds

Final thoughts

In conclusion, a blank screen on your Lennox iComfort thermostat can be a frustrating issue, but it can often be resolved by following the steps outlined in this article.

 From checking for power issues and loose wiring to resetting the float switch or the thermostat itself, there are several potential solutions to explore. 

However, it’s essential to remember that some of these solutions may require technical knowledge and expertise, and it’s best to seek help from a licensed HVAC professional if you’re not comfortable troubleshooting the issue yourself.

 Remember to take safety precautions while working with your HVAC system, turn off the power before attempting any fixes.

More resources

Lennox icomfort manual

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