Troubleshooting - Trane TCONT824 Installation Manual

Installation Guide
9.

Troubleshooting

SYMPTOM
Control displays an alert code on
the screen.
Display will not come on
Indoor temperature display is
incorrect.
Indoor humidity display is incorrect. Indoor humidity display needs calibration.
Heating will not come on.
Cooling will not come on.
Heating or Cooling is displayed,
but no warm or cool air is coming
from the registers.
Fan runs all the time
"+" symbol appears on Home
Screen beneath Indoor
Temperature readout
Fan is set to ON but not running.
Cooling or Heating cycles too
fast or too slow (narrow or wide
temperature swings).
Heat pump is not turning on; only
furnace or electric heat strips are
running.
Cannot change system mode to
desired setting.
Screen does not respond properly
to a button press
40
POSSIBLE CAUSES
A critical or major alert is present.
Loss of 24VAC between R & B at the Control.
1) Indoor temperature display needs calibration.
2) Heat from touch screen is being trapped within
the thermostat body. See section 4.1 for mounting
location guidelines.
1) System mode is not set to Heat/Auto or setpoint
is set too low.
2) Minimum off time delay is being enforced.
3) Heating system may require service.
1) System mode is not set to Cool/Auto or the
setpoint is too high.
2) Minimum off time delay is being enforced.
3) Cooling system may require service.
1) There is a fan delay as the heating or cooling
equipment turns on.
2) Equipment is not working properly.
1) Fan mode is set to On, Circulate or Clean mode
2) Field wiring issue
3) There is a failure in the indoor unit
Both compressor heat and indoor heat are being
called simultaneously
1) Humidity Control is engaged.
2) Field wiring issue
3) Blower motor is not functioning.
1) Check the location of the Control for drafts.
2) Cycles per hour is improperly set.
1) Outdoor temperature is below compressor
lockout temperature setting.
2) System mode is set to Emergency Heat.
3) Outdoor Unit may require service.
Equipment is not configured properly.
1) Screen is out of calibration.
2) Internal Control fault
ACTION
Navigate to the Diagnostic screen on the 824 Control for a
Problem Description and Possible Cause.
1) Check R & B wiring.
2) Check transformer for 24VAC output.
3) Check for broken or shorted thermostat wire.
1) Calibrate temperature sensor from Sensor Settings or
use a remote temperature sensor
2) Move Control away from competing air stream or use a
remote indoor sensor.
Calibrate humidity sensor from the Sensor Settings.
1) Set mode to heat and raise the setpoint above the room
temperature.
2) Wait for 5 minutes and recheck heating equipment.
3) Check/repair system.
1) Set mode to cool and lower the setpoint below the room
temperature.
2) Wait for 5 minutes and recheck cooling equipment.
3) Check/repair system.
1) Wait a minute for blower delays and recheck registers.
2) Check/repair system.
1) Check Control settings to see if fan is set to On,
Circulate or Clean mode.
2) Check field wiring
3) Check indoor unit for failures (such as tripped heating
limit).
No action required, symbol is for informational purposes
only
1) If indoor humidity is higher than desired setpoint, the
blower will cycle off with the equipment. A humidity icon
will be displayed on the Fan Mode button when the blower
operation is being inhibited due to high humidity.
2) Check field wiring
3) Check/repair system.
1) Seal air leaks behind Control. Relocate Control or apply
remote indoor temperature sensor.
2) Adjust cycle rates in the Advanced Installer Setup.
1) Adjust the compressor lockout temperature setting if
desired.
2) Check/repair outdoor temperature sensor or wiring.
Check the standard installer set up screen to ensure
equipment is properly configured.
1) Remove Control from sub base and reset. Follow the
calibration instructions when the Control reboots.
2) Reset/Cycle power to Control by removing it from the
subbase, waiting 10 seconds and replacing.
18-HD72D1-6