Bryant 340MAV Error Code 14: Ignition Lockout
What Does Code 14 Mean?
Status code 14 on the Bryant 340MAV is an ignition lockout. The integrated furnace control made repeated attempts to ignite the burners and prove a flame, and all attempts failed. The control locks out to prevent further unsuccessful ignition attempts and auto-resets after 3 hours.
The service documentation directs troubleshooting to code 34 (ignition proving failure), which is the active fault recorded each time an ignition attempt fails. Code 14 is the accumulated lockout that results from code 34 failures. The three most common causes are a dirty or faulty flame sensor, a defective hot surface igniter, and a gas supply issue or defective gas valve.
A technician will typically start by inspecting the flame sensor for carbon buildup on the ceramic rod (which can prevent it from detecting the flame), then test the hot surface igniter for correct resistance (a cracked or worn igniter may not heat adequately to light the gas), and verify gas pressure at the manifold. After resolving the cause, the lockout will clear on the next auto-reset or after cycling power.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Dirty or faulty flame sensor | Most common | ✗ Call a pro → |
| Defective hot surface ignitor | Common | ✗ Call a pro → |
| Gas supply issue or defective gas valve | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Contact a technician to diagnose the ignition failure — a faulty flame sensor, igniter, or gas supply issue must be identified and repaired
- If the furnace relocks out after the 3-hour auto-reset, the fault has not been resolved and requires professional service
✓ Verified against manufacturer service manual — March 2026