Toptech TT-N-411 - System Not Starting (OFF Display); Blank Display Troubleshooting; Continuous Fan Operation; System Non-Responsiveness

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Attach Thermostat to Sub-Base
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1.Lineupthethermostatbodywiththesub-base.
2.Carefullypushthethermostatbodyagainstthesub-baseuntilitsnaps
 intoplace.
NOTE: The thermostat hinges from the top and latches at the bottom.
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Setting User Options
Advanced User Options
Useroptionsallowyoutocustomizesomeofyourthermostatsfeatures.
Mostuserswillnotneedtomakeanychangestothesettingsin
thissection.
To access the User Options menu, hold down both the and buttons
for approximately 3 seconds until the screen changes and displays
the first User Option.
PresstheorbuttontochangethesettingforthedisplayedUserOption.
Afteryouhavemadeyourdesiredsetting,pressandtogetherto
advancetothenextUserOption.
Thethermostatwillreturntonormalmodeafteryourlastuseroptionis
madeorafternokeyshavebeenpressedfor5seconds.
User Factory Setting
No. Options Default Options Comments
 1 1ststage 0.5 0.5, 1.0 Selecta1ststagetemperature
   differential   or 2.0 differentialof0.5˚,1.0˚or2.0˚F
       (0.2˚,0.5˚or1.0˚C)
 2 2ndstage
2.0 1.0, 2.0,  Selecta2ndstagetemperature
   differential   3.0, 4.0 , differentialof2˚,3˚,4˚,5˚or6˚F
(TT-N-421Only) 5.0 or 6.0  (1.0˚,1.5˚,2.0˚,2.5˚or3.0˚C)
Table of User Options
Detailed Explanation of User Options:
Temperature Differential
(User Option 1 and 2)
Thedifferentialsettingisthetemperaturecontrolrangethatyourthermostat
willprovide.Thesmallerthesetting,thetighteryourrangeoftemperature
controlandcomfortwillbe.The2ndstagedifferentialisonlyforsystems
withasecondstageofheating(auxiliaryheat).