Installation and User Guide
7.1 Modify the Cooling Schedule
1.) Slide the system switch to Cool
2.) Repeat steps 2-6 from the heating schedule
7.2 Thermostat Settings
Resetting the Thermostat or Thermostat Settings
If the thermostat has good batteries, but has a blank display or
does not respond to key presses, the thermostat should be reset by
removing the batteries for 2 minutes. This reset will not change the
menu settings or program. If the condition persists after reinstalling
the batteries, replace the thermostat.
To conveniently reset only the schedule and user settings back to
factory defaults, press Menu and Backlight buttons at the same
time and hold until the display goes blank and resets.
7. Troubleshooting
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
No Heat/
No Cool/
No Fan
(common problem)
1.) Blown fuse or tripped circuit breaker
2.) Furnace power switch to OFF
3.) Furnace blower compartment door
panel loose or not properly installed
4.) Loose connection to thermostat or
system
1.) Replace fuse or reset breaker
2.) Turn switch to ON
3.) Replace door panel in proper position to engage safety interlock or door switch
4.) Tighten Connections
No Heat
1.) System Switch not set to Heat
2.) Loose connection to thermostat or
system
3.) Heating System requires service or
thermostat requires replacement
Verify thermostat and system wires are securely attached.
Diagnostic: Set System Switch to Heat and raise the setpoint above room temperature. Within
five minutes the thermostat should make a soft click sound and “Heat On” should appear on
display. This sound indicates the thermostat is operating properly. If the thermostat does not
click, try the reset operation listed below. If the thermostat does not click after being reset,
contact your heating and cooling service person or place of purchase for a replacement. If the
thermostat clicks, contact the furnace manufacturer or a service person to verify the heating
system is operating correctly.
No Cool
1.) System Switch not set to Cool
2.) Loose connection to thermostat or
system
3.) Cooling System requires service or
thermostat requires replacement
Verify thermostat and system wires are securely attached.
Diagnostic: Set System Switch to Cool and lower setpoint below room temperature. Same
procedures as diagnostic for “No Heat” condition except set the thermostat to Cool and lower
the setpoint below the room temperature. There may be up to a five minute delay before the
thermostat clicks in Cooling if the compressor lock-out option is selected in the installer menu.
(see INSTALLER MENU, item 50)
Heat, Cool or Fan Runs
Constantly
Possible short in wiring, thermostat, heat,
cool or fan system
Check each wire connection to verify they are not shorted or touching other wires. Try resetting
the thermostat. If the condition persists contact your HVAC service person.
Thermostat Display &
Thermometer Disagree
Thermostat display requires adjustment
Display can be ad/-5°. See User Menu item 04
Furnace (Air Conditioner)
Cycles Too Fast or Slow
(narrow or wide temperature
swing)
The location of the thermostat and/or
the size of the Heating System may be
influencing the cycle rate
Digital thermostats provide precise control and cycle faster than older mechanical models. The
system turns on and off more frequently but runs for a shorter time. If you would like to increase
cycle time, choose SLO for slow cycle in the Installer menu. (Reference menu items 30 & 35) If
an acceptable cycle rate is not achieved, contact your HVAC service person.
“Call for Service” icon
appears on displayed
1.) Heating system is not able to heat
the space to within 10 degrees of the
setpoint within 2 hours
2.) Cooling system is not able to cool
the space to within 10 degrees of the
setpoint within 2 hours
3.) If “--” is displayed for the Room
Temperature, a replacement thermostat
is needed
4.) None of the buttons operate on the
thermostat
1.) See corrective action for “No Heat”
2.) See corrective action for “No Cool”
3.) Replace thermostat
4.) Make sure keypad lockout is not turned on (denoted by icon)
6.5
6.6
Trane - by Trane Technologies (NYSE: TT), a global climate innovator - creates comfortable, energy efficient indoor
environments for commercial and residential applications. For more information, please visit trane.com or
tranetechnologies.com.
Trane has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed to
using environmentally conscious print practices.
© 2020 Trane
18-HD51D1-1C-EN
(09
Sept
2020)
Supersedes
18-HD51D1-1B-EN
(
27 Mar 2019
)
