Carrier 58MVP Error Code 14: Ignition Lockout
What Does Code 14 Mean?
Status code 14 on the Carrier 58MVP is an ignition lockout. After repeated failed ignition attempts (tracked as code 34), the control gives up and locks the furnace out for a 3-hour auto-reset period. Carrier's guide cross-references code 34 (Ignition Proving Failure) for the underlying causes.
The furnace runs its normal sequence — inducer, hot surface igniter, gas valve — but the flame sensor never confirms a stable flame, or flame is lost right after ignition. Once the control's retries are exhausted it enters this lockout. The most common cause is a failed hot surface igniter; a dirty or cracked flame sensor is also common.
On this variable-speed furnace, correct ignition and flame proving are safety-critical and involve the gas valve, igniter, and flame-sense circuit — components that require a technician. This is not a homeowner repair.
What You'll Notice
- The furnace tries to light several times, then goes silent and produces no heat
- The board LED flashes code 14 and the furnace stays off for up to 3 hours
- The igniter may not glow, or the burners light briefly then go out
- No warm air even after multiple start attempts
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Failed hot surface igniter | Most common | ✗ Call a pro → |
| Dirty or cracked flame sensor | Common | ✗ Call a pro → |
How This Is Diagnosed
A technician confirms the hot surface igniter reaches proper temperature and resistance, measures the flame sensor's microamp signal, and verifies inlet gas pressure and that the gas valve is opening. They also inspect the flame-sense wiring and ground. Because this involves the gas valve, igniter, and flame circuit, the diagnosis and repair are done by a professional, not as DIY.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The furnace repeatedly locks out on code 14 and will not stay lit
- The igniter does not glow during the ignition sequence
- The burners light briefly then drop out within seconds
- You smell gas near the furnace when it attempts to light
Frequently Asked Questions
How do I reset code 14 on a Carrier 58MVP?
The control auto-resets after about 3 hours, or you can cycle power. But it will lock out again unless the underlying ignition fault — igniter, flame sensor, or gas supply — is repaired by a technician.
What's the difference between code 14 and code 34?
Code 34 is the active ignition-proving failure while the furnace is still retrying; code 14 is the lockout it becomes after those retries fail. Both point to the same ignition and flame-sensing causes.
Is code 14 dangerous?
The lockout itself is protective — it stops the furnace from repeatedly releasing unburned gas. The root cause should be fixed by a professional so the furnace can heat safely.
Sources
✓ Verified against manufacturer service manual — March 2026