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TCONT900AC43UA
0363. If the balance point for a particular heater stage is
disabled, that heater stage will be used during every
defrost cycle independent of the outdoor temperature.
NOTE: NOTE: If the outdoor sensor is no longer report-
ing, all available heater stages will be used dur-
ing defrost.
When an outdoor temperature sensor has not been
discovered/enabled, the stage or combination of stages to
be used during defrost can be set in Installer Setup
Number 0364.
Operation in Emergency Heat Mode
When the Comfort Control is placed in Emergency Heat
mode, the compressor and auxiliary lockout features are
turned off. In the Emergency Heat mode, the compressor
is locked out and only the auxiliary heat operates. The
Comfort Control is capable of controlling up to a maximum
of three Emergency Heat stages.
Heat Pump with Fossil Fuel Heat (Dual Fuel) and
Outdoor Temperature Sensor
In this operation, there is no external fossil fuel kit (dual
fuel kit) installed; the Comfort Control controls this
function. During the transition between Furnace and heat
pump operation, there is a minimum Comfort Control time
delay of 45 seconds between the Furnace turning off and
the heat pump turning on and 0 seconds between the
heat pump turning off and the Furnace turning on.
NOTE: If the outdoor is missing or no longer reporting,
the control algorithm will revert back to a fossil
fuel only application.
For non-communicating equipment, configure the Comfort
Control by:
1. Choose Heat Pump Application in Installer Setup
Number 0172.
2. Choose Fossil Fuel Option as the backup heat
source in Installer Setup Number 0200.
TROUBLESHOOTING GUIDE
Refer to Table 8 for troubleshooting information.
Symptom
Red service LED is illuminated
and the display alternates
between Home screen and Alert
Code screen.
Display will not come on.
Indoor temperature display is
incorrect.
Indoor humidity display is
incorrect.
Pub. No. 18-HD32D1-2
69-2079—05
Table 7. Troubleshooting Information
Possible Cause
Alert Code present
1. Blown fuse or tripped circuit
breaker.
2. Indoor unit power switch OFF.
3. Indoor unit blower
compartment door or panel loose
or not properly installed.
4. Wire broken/shorted; or R and
D or B and D are reversed.
Temperature display needs
calibration.
Indoor humidity display needs
calibration.
3. Outdoor Temperature Sensor for Control Option
is automatically chosen in Installer Setup Number
0342.
4. Choose appropriate Dual Fuel Heat Pump Control
in Installer Setup Number 0345.
NOTE: If the heat pump fails to maintain heat while the
outdoor temperature is above the auxiliary lock-
out temperature, the Furnace will be used until
the setpoint is reached, at which time heat pump
operation will resume.
5. Choose appropriate Compressor Lockout Tem-
perature in Installer Setup Number 0350.
6. If heat pump auxiliary lockout was selected in
Installer Setup Number 0345, choose appropriate
Heat Pump Auxiliary Lockout Temperature in
Installer Setup Number 0360.
7. Choose appropriate Defrost Balance Point Tem-
peratures in Installer Setup Numbers 0361 - 0363.
Heat Pump with Electric Auxiliary (Backup) Heat
and Outdoor Temperature Sensor
For non-communicating equipment, configure the Comfort
Control by:
1. Choose Heat Pump Application in Installer Setup
2. Choose Electric Option as the Auxiliary (Backup)
Heat Source in Installer Setup Number 0200.
3. Choose appropriate Outdoor Temperature Sensor
for Control Option in Installer Setup Number 0342.
4. If Outdoor Temperature Sensor was discovered/
enabled in Installer Setup Number 0342, choose
appropriate Compressor Lockout Temperature
in Installer Setup Number 0350.
5. If Outdoor Temperature Sensor was discovered/
enabled in Installer Setup Number 0342, choose
appropriate Heat Pump Auxiliary Lockout
Temperature in Installer Setup Number 0360.
6. If Outdoor Temperature Sensor was discovered/
enabled in Installer Setup Number 0342, choose
appropriate Defrost Balance Point Temperatures
in Installer Setup Numbers 0361 - 0363.
Refer to the Alert Code Addendum (form
18-HD32D2-1/69-2009).
1. Replace fuse or reset breaker.
2. Turn power switch to ON.
3. Replace door panel in proper position
to engage safety interlock or door switch
on furnace.
4. Check R, B, D wiring.
Calibrate Sensor - ISU 0700
Calibrate Sensor - ISU 0701
20
Action
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