What It Means
Indoor unit anti-cold blow or defrost protection active.
York All Systems
York Error Code P1
Troubleshooting guide for the York system fault P1.
Possible Causes
- Normal heat pump defrost cycle active.
- Low indoor coil heat output during heating start.
- Defrost temperature sensor or indoor coil sensor fault.
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
Anti-cooling or Defrost Protection.
All Recorded Causes
Verify Before Replacing Parts
- Confirm the exact York model family and default context before acting on a generic code description.
- Start with the exact model documentation and verify the full operating sequence before replacing parts, particularly around the most likely cause listed above.
- Use the listed causes as branches to confirm or eliminate with measurements, not assumptions — the next candidate on the list is a reasonable second branch.
- 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.
