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Started By
Message
Lennox Thermostat
Posted on 10/4/25 at 10:06 pm
Posted on 10/4/25 at 10:06 pm
Almost five years ago, my Dad started building a cabin in another state. I knew little of the process. Didn’t know the contractor or anything. In 23 he passed away and as the only child I was left to finish it out. At the time it was about 65% finished.
About a month ago we passed final inspection and everything seems to be working fine, however I can’t seem to get the Lennox thermostats to come on. Power is on, breakers are hot…and to make matters worse, I don’t know who he purchased the system from.
Someone told me I had to download an app to my phone.
If anyone could help me out it would be greatly appreciated. I’ve watched several YouTube videos but still can’t figure it out.
About a month ago we passed final inspection and everything seems to be working fine, however I can’t seem to get the Lennox thermostats to come on. Power is on, breakers are hot…and to make matters worse, I don’t know who he purchased the system from.
Someone told me I had to download an app to my phone.
If anyone could help me out it would be greatly appreciated. I’ve watched several YouTube videos but still can’t figure it out.
4
Posted on 10/5/25 at 6:51 am to geauxbrown
Junk em and grab a $40 Honeywell.
Posted on 10/5/25 at 8:28 am to geauxbrown
Do you have 24v power to the thermostat?
Posted on 10/5/25 at 9:07 am to geauxbrown
Most system manufacturers have a relatively limited number of companies that install their brand for a given area. I would try to figure out the company that did the install.
This post was edited on 10/5/25 at 11:39 am
Posted on 10/5/25 at 9:56 am to White Bear
quote:
Do you have 24v to the thermostat?
Unsure but the electric passed final inspection.
These thermostats don’t have external switches. It’s all touch screen….so until I can get them to power up I’m out of luck
Posted on 10/5/25 at 10:08 am to geauxbrown
Do they have batteries in them? I had to replace mine last night.
Posted on 10/5/25 at 10:10 am to Lefty Diego
quote:
Do they have batteries in them?
If they do, I can’t find where they go…and I can’t find a YT video that talks about batteries.
Posted on 10/5/25 at 11:37 am to geauxbrown
On mine, you pull the face strait off and the batteries go in it.
Posted on 10/5/25 at 11:48 am to Lefty Diego
quote:
On mine, you pull the face strait off and the batteries go in it.
I have a Lennox unit as well and mine works in this way too. If the batteries haven’t been changed in 5 years, you certainly need to change them. Might have never been installed.
Posted on 10/5/25 at 11:50 am to Lefty Diego
quote:
On mine, you pull the face strait off and the batteries go in it
I've pulled the face off but I can't see a slot for batteries. With that said, I'm not very mechanically inclined. I've had other people look also and can't seem to find a slot for batteries.
Posted on 10/5/25 at 5:22 pm to geauxbrown
Have you checked the breakers?
What’s the model number for the thermostat?
What’s the model number for the thermostat?
Posted on 10/5/25 at 7:10 pm to Tyga Woods
quote:
Have you checked the breakers?
What’s the model number for the thermostat
15Z69 Lennox M30 Touchscreen
Posted on 10/5/25 at 7:32 pm to geauxbrown
That thermostat doesn’t seem to have batteries.
I’d try turning the power off for a few minutes then back on and see if it comes on.
Also could be the drain pan switch
I’d try turning the power off for a few minutes then back on and see if it comes on.
Also could be the drain pan switch
This post was edited on 10/5/25 at 7:33 pm
Posted on 10/5/25 at 10:06 pm to Tyga Woods
quote:
also cpuld be a drain pan switch
Not sure what that is but will google
Thank you.
Posted on 10/5/25 at 10:34 pm to geauxbrown
quote:
Not sure what that is but will google
Your inside unit will probably have one or two float switches. If they sense water backing up, they shut the unit off. They can be defective or go bad just like anything else. One will be in the pan, another could be in a pvc pipe coming from the bottom of the unit.
Posted on 10/5/25 at 10:52 pm to Koolazzkat
quote:
Junk em and grab a $40 Honeywell.
My new home came with them, called my A/C guy, said they were junk. Replaced them around a year or two in the house.
Posted on 10/5/25 at 11:43 pm to LSUDad
quote:
My new home came with them, called my A/C guy
I had Lennox unit installed a few years back and the AC folks installed the basic Honeywell with my new Lennox unit without asking!
Posted on 10/5/25 at 11:44 pm to Spankum
quote:
had Lennox unit installed a few years back and the AC folks installed the basic Honeywell with my new Lennox unit without asking!
We replaced all three with new Honeywell’s. No problems.
This post was edited on 10/6/25 at 12:04 am
Posted on 10/6/25 at 9:55 am to geauxbrown
If you haven't gotten a solution yet this may or may not help.
I also inherited a lennox system a while back and the way this particular system was setup only allowed for Lennox thermostats because of the way the thermostat communicated with the unit. I found this out the hard way when I tried to install a Nest or one of the smart thermostats and it did not work at all. This was like 6 years ago.
Anyway, just throwing it out there that it could be an issue if the thermostat not properly communicating with the unit as that is something proprietary for Lennox.
What is the specific problem when you say you can't get it to come on? Like it won't even power up?
I also inherited a lennox system a while back and the way this particular system was setup only allowed for Lennox thermostats because of the way the thermostat communicated with the unit. I found this out the hard way when I tried to install a Nest or one of the smart thermostats and it did not work at all. This was like 6 years ago.
Anyway, just throwing it out there that it could be an issue if the thermostat not properly communicating with the unit as that is something proprietary for Lennox.
What is the specific problem when you say you can't get it to come on? Like it won't even power up?
Posted on 10/6/25 at 12:24 pm to LSUDbrous90
quote:
What is the specific problem….
Can’t get the thermostats to power up.
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