Rheem R802VA07542117MSA Error Code T087_F: Power Board Temp Sensor Fault
What Does Code T087_F Mean?
Fault code T087_F on the Rheem R802VA indicates that the temperature sensor integrated into the power board (control board) itself has failed or is reporting an invalid value. This onboard sensor is used to monitor the operating temperature of the IFC electronics and can serve as a thermal protection feature to prevent the board from overheating.
With this sensor out of service, the IFC loses its self-monitoring capability for board temperature. In environments with high ambient temperatures or poor furnace room ventilation, this increases the risk that board electronics could overheat without triggering protective action. The T (troubleshooting) prefix means this was an intermittent observation.
Because the temperature sensor is integrated into the control board rather than being a separate replaceable component, a fault here typically means the control board itself needs to be evaluated. In some cases, the sensor failure may also indicate that the board has already experienced a thermal event that degraded the sensor.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Failed onboard temperature sensor on control board | Most common | ✗ Call a pro → |
| Control board overheating from poor ventilation | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Schedule a service call — a technician should inspect the control board and evaluate whether replacement is required
- A technician should also check the furnace installation environment for adequate ventilation to prevent board overheating
- If the fault persists or the board shows signs of heat damage (discoloration, burnt smell), immediate replacement is needed
✓ Verified against manufacturer service manual — March 2026