What does A101 mean?

The suction temperature sensor has failed, causing the unit to switch to electric elements for heating. The heat pump is disabled due to this sensor malfunction.

• Failed suction temperature sensor
• Wiring issue to the sensor

Click steps to track your progress.

1. 1

   Check the wiring and sensor connections.

2. 2

   Measure the sensor's resistance with a multimeter and compare it to the Ohm chart.

3. 3

   Power down the unit and unplug the thermistor, then check resistance again to confirm the reading.