King Electric Atmoz Wifi V3.1-OTA TH1250WF Line Volt Thermostat Tear Down And Quick Review.. 
Let Me Save you Some Reading Time.. This Thermostat Currently is a Big Waste of Time and Money.
If You Want to Use The App and Smart Home Features There May Be a Undisclosed Privacy Risk!
So Far this Device as a manual thermostat is good.. but as for the Android App Atmoz and Atmoz 2 is a major failure..
It looks to be a server issue with King Electric’s Smart Home Data Partner Ayla Networks More on that Down Further!!!
Read More If You Wish..
Powered Up.. Has A Nice Display..
As it Was Out of the Box.. 
To Open it it is just one screw you have to open it to be able to mount it on the wall. Yes there is a Non Attached Cover that goes between boards. Removed for Photo. PCB Marked TH1250PWF-V1-1807
Back Side Of Power Board Held In with 2 Small Screws. Again Mixed House Brand Capacitors.. I Did Not Bother Removing the Front PCB Yet. I Will Later and Get the Display Info. The Switching Relay is a 24V 16A SCHRACK – TE CONNECTIVITY RT314024 So it may last a while.. 
Wi-Fi Card is an AMPAK WSDB750GN WiFi-MCU Module FCC Data & User Manual 
MCU is a Renesas Technology Corp R5F10WMCA (Data Sheet)
Decoding The MCU Info.
R = Rennisis
5 = MCU
F = Flash
10W = RL78/L13 Group
M = 80-pin
C = 32KB Rom
A = Consumer applications, operating ambient temperature -40°C to 85°C
Figured they Would Have Used A Code
G, L = Industrial applications, operating ambient temperature -40°C to 105°C
Or Even Better
K, M = Industrial applications, operating ambient temperature -40°C to 125°C
Y = Industrial applications, operating ambient temperature -40°C to +150°C
Jumper Locations And Some Other Connectors! 
For what they are charging for these I would think that would go with Name Brand Capacitors but Nope!! Cheap House / Generic Brands! Yes Brands Multiple. 
The App’s are Broken!! The apps will Install and Allow you to Sign Up and you will get an e-mail. But the E-mail is Not Complete!! The Link is there but hidden Missing image or Text.. So the link is Hidden below the Activation / Verification Code See 2nd Image. 
When you Click empty space to trigger the link they sent from your device on the E-mail The Link Launches the App and Will not take Password says it is wrong. 
This is the Link.. IN the Browser..
“https://app-launcher.aylanetworks.com/launch?custom_url=kingI-th1250wf://user_sign_up_token?token=%5B%5Buser_confirmation_token%5D%5D”
The web browser that open gives a 500 Error…
“{“error”:{“code”:”500″,”message”:”500 – Internal server error. The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, admin@aylanetworks.com, and inform them of the time the error occured. More information about this error may be available in the server error log.”}}”
Atmoz 1 app Will let you log in with a Gmail account But the Atmoz 2 app will Not it gives an Error, And the Face Book Connect Is Broken on both.
The to Enable the Alexa Skill it requires you to link your account Ayla Networks. “Not King Electronics” Via Ayla Networks (Sign in Link) !! King Electric and Ayla if you cannot complete the Sign Up process for an account you cannot link your account to the Atmoz Alexa Skill..
Ayla Networks Phone # Just Goes o Voice Mail..
King Electronics Also Just Goes to Voice Mail..
Facebook Both No Answer..
NO TECH SUPPORT Evening or Weekends = Bad!! I can get a 6.00 China Smart Wifi switch and if there is an issue a Facebook or twitter Response is min’s away..
I was able to get in but it took a little work figuring out and editing their link from a closer inspection of the HTML Above e-mail on a PC.. (%5B%5B) was replaced with (avhx4FFu) your code will be different..
“https://app-launcher.aylanetworks.com/launch?custom_url=kingI-th1250wf://user_sign_up_token?token=avhx4FFu”
You have to do this for both apps.. I am not sure why? it makes it way to complex..
I hope the above and the following helps people having issues.. A Person should not have to spend an entire Saturday messing with something trying to figure out why Aylan Networks and King Electric have these errors!
Update: 9:08 PM I am Still Trying to Link the Alexa Skill But Now Account is Locked.. I Guess To many Log In Attempts LOL… 
Ok, I have Insomnia!
It 10:45 PM I have Connected to Atmoz (1) App, I was able to validate and Log In by making my own link from the e-mails.
I was able to Enable the Alexa Skill and Connect to the Ayla Networks.
I was able to Get Alexa to Discover the Device! Alexa
Another Issue. The Reset Button on the Side Would NOT Reset the Wifi to Default.
I had to turn off The 1st Router I connected to under my Gmail Login, Reset the Device, Connect Wifi Direct to The Atmoz, and Connect Phone to another Internet Enabled router to be able to login and have the Atmoz app discover the device. Then plug the Main Router Back in, and Set it Up!!
This software is buggy as hell.. Way over complicated!! I hope I do not have to go thru this much hassle to reset the wifi again if I change a SSID or Want to Connect to another network.
I am Sure Glad I Got Just “1 Thermostat” to try and not the 6 Additional to replace everyone in the house! After this experience there is No way would I would pay the price because of the poor build quality, poor software, complex setup, and!!
The Other Big Thing!!
That King Electric is outsourcing the Data Custodian of these Devices to Ayla Networks which is worrisome has me wondering if Ayla Networks can be trusted with the meta data collect from the app.. Here is their (Privacy Policy) Do a google search ayla data collection and sales.
I had to learn this without any upfront disclosure on the King Website, Catalog Page, Printing on the Box, or on the google play app page. All the photo’s say Atmoz by King.. it should be disclose upfront that Ayla Networks handles the data not King. What is funny in their November 7th What’s New “Fix Password Error Message For Registration”.. Nope King You Did Not Fix It!!
As of Now With The King Line Volt Wifi Thermostat Do Not Walk But Run Away or Just Buy the K702E-2 SIMPLSTAT or One of the other Wifi Choices. For Line Volt Thermostats
Update: 09/2021
This thermostat has major bugs #1 is it will loose it s settings and the heater will come on unexpectedly, Will not hold set temp if using the panel controls but will if using the app. Still searching for an affordable alternative.
Last Updated on September 18, 2021 by Steven Rhine