Outdoor coil temperature sensor fault. The chart says the heat pump fails to operate in heating mode, and the display shows A3.
Goodman A3 on the PCBHR104 chart is an outdoor coil temperature sensor fault, and the symptom line says the heat pump fails to operate in heating. Causes match A2: shorted, open, disconnected, or out of range. A2 does not carry that heating-failure symptom. The actions are to check the connection and replace an open or shorted sensor. The same text is repeated on the PCBHR105 chart.
Likely causes
- Shorted sensor
- Open sensor
- Sensor disconnected
- Sensor out of range
Safe checks for A3
- If the heat pump will not heat and the display reads A3, leave the electrical panel closed
- Techniciancheck the sensor connection and replace an open or shorted sensor, with power off, using the correct replacement part
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician. A heat pump that will not heat on A3 is a sensor fault in this chart, not a reason to add refrigerant.
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