What It Means
Indoor unit T5 coil temperature sensor malfunction.
L
Luxaire All Systems
Luxaire Error Code E5
Troubleshooting guide for the Luxaire system fault E5.
Possible Causes
- Damaged, corroded, or loose T5 sensor wiring or connector pins.
- Improperly seated T5 sensor on coil or pipe.
- Erratic, open, or shorted T5 thermistor resistance.
- Defective T5 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.
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Full Diagnosis
Indicates a malfunction of the indoor unit's T5 temperature sensor, a separate sensor position from both the room-ambient thermistor (E1) and the T1 sensor (E2). T5 is generally used for coil-temperature monitoring that supports defrost timing and anti-freeze protection. A sustained T5 fault typically halts the active cycle and blocks compressor restart until the sensor input returns to a valid range.
All Recorded Causes
Inspect the T5 sensor's wiring and connector at the indoor control board for damage, corrosion, or a loose pin. Confirm the sensor is seated correctly against the coil or pipe it monitors. Check sensor resistance at a known temperature against the manufacturer's chart. Replace the sensor if readings are erratic, open, or shorted.
Verify Before Replacing Parts
- Confirm the exact Luxaire model family and default context before acting on a generic code description.
- Confirm filter condition, blower operation, and coil cleanliness before replacing any controls — start by ruling out whether inspect the T5 sensor's wiring and connector at the indoor control board for damage, corro….
- Measure airflow-related readings that match the symptom, such as temperature split or static pressure, and check whether confirm the sensor is seated correctly against the coil or pipe it monitors.
- After the correction, run the system long enough to confirm the default fault does not return under normal load.
Not sure which system this Luxaire code is on?
ACLogics has guided diagnostics for 60 Luxaire fault codes and asks the right questions to narrow it down.
