What It Means
Indoor unit T2A coil/pipe temperature sensor hardware fault.
York All Systems
York Error Code E3
Troubleshooting guide for the York system fault E3.
Possible Causes
- T2A sensor wiring or PCB connector loose, corroded, or damaged.
- Sensor unclipped or improper thermal contact with coil/pipe.
- Sensor resistance out of specification (open or shorted).
- Faulty T2A temperature sensor requiring replacement.
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
E3 indicates the indoor unit's T2A temperature sensor — a coil/pipe sensor position distinct from T1 (reported under E2) and T3 (reported under E5) — is reading open, shorted, or outside its valid range. This is a physical sensor hardware fault, unlike E4, which reports a corrupted indoor EEPROM (stored configuration memory) rather than any temperature reading. When E3 trips, the indoor unit typically ends the active cycle and blocks compressor restart on that zone until the sensor input returns to normal, without affecting other indoor units on the same outdoor system.
All Recorded Causes
Check the T2A sensor's wiring and connector at the indoor PCB for looseness, corrosion, or damage. Confirm the sensor is properly clipped to its coil or pipe location and making good contact. Test sensor resistance at a known temperature against the manufacturer's chart. Replace the sensor if it reads open, shorted, or inconsistent with actual coil temperature.
Verify Before Replacing Parts
- Confirm the exact York 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 check the T2A sensor's wiring and connector at the indoor PCB for looseness, corrosion, or….
- Measure airflow-related readings that match the symptom, such as temperature split or static pressure, and check whether confirm the sensor is properly clipped to its coil or pipe location and making good contac….
- After the correction, run the system long enough to confirm the default fault does not return under normal load.
Not sure which system this York code is on?
ACLogics has guided diagnostics for 60 York fault codes and asks the right questions to narrow it down.
