Rheem R802VA07542117MSA Error Code T082_F: Supply Air Sensor Fault
What Does Code T082_F Mean?
Fault code T082_F on the Rheem R802VA is a troubleshooting-level fault that applies only to two-stage models. It indicates that the supply air temperature sensor — which monitors the temperature of heated air leaving the heat exchanger and entering the supply ductwork — has failed or is reading outside the expected range.
In a two-stage R802VA furnace, the supply air sensor helps the IFC monitor heat exchanger performance and can be used to detect conditions like excessive supply air temperature that could indicate airflow restriction. When this sensor is unavailable, the furnace loses visibility into supply air temperature but may continue operating in a degraded mode.
The T (troubleshooting) prefix means this is an intermittent rather than persistent fault — the furnace may continue running and the code may clear on its own. In practice, this means if the code disappeared after a cycle or appeared only once, the cause is likely a loose connector or corroded pins rather than a fully failed sensor. Possible causes include a failed supply air thermistor, a disconnected or damaged sensor wire, or corroded connector terminals at the sensor or the control board. A technician should check the connector first before replacing the sensor.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Failed supply air temperature thermistor | Most common | ✗ Call a pro → |
| Disconnected sensor wiring | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Schedule a service call — the supply air temperature sensor needs to be tested and likely replaced by an HVAC technician
- A technician should check the sensor wiring and connector pins for damage or corrosion before replacing the thermistor
- This fault applies only to two-stage R802VA models; a technician should confirm the correct sensor part number for this specific model
✓ Verified against manufacturer service manual — March 2026