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Carrier ComfortLink Alarm 31 – Supply Air Sensor Fault Explained
Carrier ComfortLink Alarm 31 typically indicates a supply air temperature sensor out-of-range condition.
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Trane RTU Error Code 79 – What It Means and How to Fix It
Trane RTU Error Code 79 commonly indicates a communication fault between the unit controller and a connected module or sensor.
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Trane RTU Error Code 33 – Causes and Troubleshooting
On many Trane rooftop units, Error Code 33 indicates a low-pressure switch fault or refrigerant circuit protection issue.
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Trane RTU Error Code 91 – What It Means and How to Fix It
Trane RTU Error Code 91 indicates a supply air temperature sensor fault. Learn what causes it, how to troubleshoot it, and when replacement is needed.
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Carrier ComfortLink Alarm 42 – Causes and Reset Procedure
Carrier ComfortLink Alarm 42 indicates a supply air temperature sensor fault or an invalid temperature input. Learn what causes it, how to troubleshoot it, and when replacement is needed.