Code 71 — Infinity/Evolution ODU Two Capacity Thermal Cutout in Low Stage

What does 71 mean?

This fault indicates that the Infinity/Evolution Outdoor Unit (ODU) has experienced a thermal cutout while operating in its low capacity stage. This is a safety measure to prevent overheating.

• Restricted airflow over the outdoor coil
• Dirty outdoor coil
• Overcharged refrigerant system (unlikely in low stage)
• Malfunctioning outdoor fan
• Faulty thermal sensor or cutout switch

Click steps to track your progress.

1. 1

   Ensure the outdoor unit's coil is clean and free of debris, and the fan is spinning freely.

2. 2

   Check that indoor air filters are clean and all vents are open.

3. 3

   Turn off the power to the outdoor unit at the circuit breaker for 30 seconds, then restore power.

4. 4

   If the thermal cutout occurs repeatedly, contact a qualified HVAC technician to inspect the system.