Carrier 59SC2B Error Code 11: No Previous Code
What Does Code 11 Mean?
Status code 11 on the Carrier 59SC2B indicates the diagnostic memory is empty — no error codes have been recorded. The 59SC2B stores the last fault code in memory so a technician can retrieve it later for troubleshooting, even after the furnace resumes normal operation.
Stored codes are automatically erased after 72 hours. If a minor issue occurred and self-resolved — for example, a brief pressure switch interruption caused by a wind gust — the code would have been stored temporarily and then cleared after three days. Code 11 appearing during recall confirms that either nothing went wrong, or enough time has passed for the stored code to expire.
To recall the last stored code on the 59SC2B, you can briefly remove and reconnect one main limit wire. After the code recall completes, the board will automatically run a component test. If code 11 is displayed, the system has a clean history.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| No faults have occurred in the last 72 hours | Most common | — |
- If the furnace is malfunctioning despite showing no stored codes — the problem may be intermittent and require a technician to monitor the system during operation
✓ Verified against manufacturer service manual — March 2026