TCONT900AC43UA
Pub. No. 18-HD32D1-2
69-2079—05 22
Heating cycle too fast or too slow
(narrow or wide temperature
swing).
The location of the control and/or
the size of the heating system
may be influencing the cycle rate.
Verify/adjust cycle rates - ISU 0240,
0250, 0260.
Only Furnace heat; no heat pump
heating in Dual Fuel mode.
1. Outdoor temperature sensor is
missing or no longer reporting.
2. Outdoor temperature is below
the Compressor Lockout
Temperature setting.
1. Check/ repair outdoor sensor field
wiring.
2. Lower the Compressor Lockout
Temperature setting, if desired.
Cannot change system mode to
Heat or Cool mode.
1. Comfort Control not configured
properly.
1. Check/verify System Selection - ISU
0172.
No equipment is running and can
not change the mode from “OFF”.
Equipment was not connected
during Auto-Discovery mode.
1. Check/verify wiring connection and
cycle power to components.
2. Cycle Power - System will Re-initiate
Auto-Discover.
Table 7. Troubleshooting Information
Symptom Possible Cause Action
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