H9-00 — OU: Malfunction of outdoor air thermistor

¿Qué significa H9-00 ?

The thermistor (temperature sensor) measuring the outdoor air temperature in the outdoor unit (OU) is malfunctioning.

• Defective outdoor air thermistor
• Damaged wiring
• Sensor blockage

Haga clic en los pasos para seguir su progreso.

1. 1

   Ensure the outdoor air thermistor is clean and unobstructed.

2. 2

   Check the wiring connected to the thermistor.

3. 3

   Restart the unit.

4. 4

   If the issue persists, contact a service technician.