Quest Controls 100 T-Stat LLC, User Manual, Page: 9 / 9

T- Stat LLC User’s Manual Rev 3.2, 04/10/18 Page | 9
5.0 Troubleshooting
LCD Screen is dark and no characters are
displayed Remove cover and verify presence of power on the “R”
terminal, check connection of the common on the “C”
terminal. Check for presence of 24VAC between R and C.
T-Stat mode say Cool1, but compressor
does not engage Verify connection to HVAC unit. Ensure short-cycle timer is
not inhibiting unit.
Buttons do not respond Press buttons slowly, some functions may take pressing the
button twice.
Display is corrupted First, cycle power to the unit. If this does not correct the
problem, reset system by removing the T-Stat body from the
mounting plate. Then return the body to the mounting plate
while depressing the up arrow, center button and down
arrow all at the same time. The display will respond with
“Cold Sense”, these buttons must be held for a minimum 5
second. This will begin a
system restart and the
display will respond with
“Cold Start”. Release the buttons at this time. This action
will reset the T-Stat and return all settings to their factory
defaults.
Contact Information:
Web Site
www.questcontrols.com
Quest Controls, Inc.
Tel: (941) 729-4799, Fax: (941) 729-5480
208 9th Street Dr. West, Palmetto FL 34221
Technical & Applications Support:
CustomerService@QuestControls.com
(941) 729-4799 Option 5
RMA Support:
(941) 723-4112
Cold Start