Code 56 — Temperature Sensor Out of Range

What does 56 mean?

This fault indicates that a temperature sensor (OAT-OCT Thermistor for 18VS,19VS/V-HP/AC, Greenspeed/Extreme, or a general temp sensor for Infinity/Evolution ODU units) is reporting values outside its normal operating range. This means an invalid reading.

• Faulty temperature sensor (thermistor)
• Damaged or loose wiring to the sensor
• Sensor disconnected or shorted
• Environmental conditions outside of system design limits (extreme cold/heat)

Click steps to track your progress.

1. 1

   Turn off the power to the outdoor unit at the circuit breaker for at least 30 seconds.

2. 2

   Restore power and observe if the fault clears.

3. 3

   Ensure no physical damage or obstructions are near the outdoor temperature sensor.

4. 4

   If the 'out of range' error persists, contact a qualified HVAC technician for diagnosis and sensor replacement.