Trane TCONT900AC43UA Installer's Manual page 22

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