F40 -21 — Condenser outlet temperature sensor shorted or broken

What does F40 -21 mean?

The temperature sensor measuring the temperature at the condenser outlet is faulty. It could be shorted, broken, or disconnected.

• The condenser outlet temperature sensor is damaged.
• Loose or broken wiring to the sensor.
• The sensor connector is faulty.

Click steps to track your progress.

1. 1

   Inspect the condenser outlet temperature sensor for damage.

2. 2

   Check the wiring and connector for the sensor.

3. 3

   Ensure the sensor is properly connected.

4. 4

   Turn off the unit, unplug it, wait 30 seconds, and plug it back in to reset.