Carrier 58MVC Error Code 11: No Previous Code
What Does Code 11 Mean?
The variable-speed control on the 58MVC stores its most recent status codes so a technician can review recent diagnostic history. Code 11 means that memory is empty: no fault codes have been recorded in the last 72 hours.
Stored status codes are erased automatically after 72 hours. They can also be cleared any time 115 VAC or 24 VAC power is interrupted — for example when the furnace disconnect is switched off during troubleshooting, or during a brief power outage. So if you previously saw a fault code and then cycled the power, the stored code is wiped and code 11 appears on the next readout.
This matters when you are chasing an intermittent problem. If a fault clears itself and then the 72-hour window passes, the board shows code 11 and the earlier fault is gone. To capture an intermittent fault, run the furnace through a complete heating cycle and read the LED immediately after any abnormal behavior, before the memory resets.
What You'll Notice
- The status LED flashes code 11 (one short flash, one long flash) when you retrieve stored codes
- No other fault codes are stored, indicating a clean recent history
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| No faults have occurred in the last 72 hours | Most common | — |
How This Is Diagnosed
No diagnosis is required — code 11 simply reports that the fault memory is empty. If you are troubleshooting an intermittent issue and see code 11, the earlier fault has either aged out of the 72-hour window or was cleared by a power interruption. Watch the furnace through several cycles and read the LED right after any abnormal behavior to capture a live fault code before it clears.
- No service is needed for this status — it means the board has no stored faults
- If you suspect an intermittent problem, monitor the furnace through several heating cycles and call a technician if a specific fault code appears
Frequently Asked Questions
What does code 11 mean on a Carrier 58MVC?
It means the control board has no stored fault codes — no errors have been logged in the past 72 hours. It is a normal, healthy status.
I had a fault code before and now it shows code 11 — where did it go?
Stored codes are erased after 72 hours or whenever power is interrupted. If you cycled the furnace power or enough time passed, the earlier code is wiped and code 11 appears. Catch intermittent faults by reading the LED right after the furnace misbehaves.
✓ Verified against manufacturer service manual — March 2026