Unit frequently turns on and off (short cycling) without maintaining a stable room temperature.

Steps to try:

• Relocate sensor (if external): If your Tristar model uses a wired remote or external sensor, ensure it is not in the direct path of supply air.
• Clean filters and coils: Improve airflow to reduce rapid temperature changes at the sensor.
• Adjust setpoint and fan speed: Use a moderate setpoint and continuous fan mode to stabilize room temperature.

When to call a technician: If short cycling persists, the control logic or sensor may be faulty and require professional service.