What It Means
Outdoor ambient temperature sensor circuit open or shorted.
American Standard AC & Heat Pump
American Standard AC & Heat Pump Error Code Red 5 Flashes
Troubleshooting guide for the American Standard AC & Heat Pump system fault Red 5 Flashes.
ACLogics Fix American Standard code Red 5 Flashes See how ACLogics handles it → Fix Red 5 Flashes step-by-step
Possible Causes
- Damaged or disconnected ambient sensor wiring.
- Faulty outdoor ambient temperature sensor.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
New to this code? Click to see why this happens
Full Diagnosis
Ambient (outdoor) temperature sensor fault (open or short circuit).
All Recorded Causes
Locate the ambient sensor on the outdoor unit and check its wiring. If wiring is intact but the code persists, the sensor likely needs replacement.
Verify Before Replacing Parts
- Confirm the exact American Standard model family and ac and heat pump context before acting on a generic code description.
- Verify the sensor or thermistor reading against the expected range for the current operating condition, keeping in mind that locate the ambient sensor on the outdoor unit and check its wiring.
- Check the sensor harness and board connection before condemning the sensor itself; on American Standard units this is also where you'd confirm if wiring is intact but the code persists, the sensor likely needs replacement.
- After the correction, run the system long enough to confirm the ac and heat pump fault does not return under normal load.
Not sure which system this American Standard code is on?
ACLogics has guided diagnostics for 36 American Standard fault codes and asks the right questions to narrow it down.
