What This Error Means

Carrier Error Code 14 indicates that the furnace control board has placed the system into lockout after repeated unsuccessful attempts to complete a heating cycle. The furnace will stop trying to ignite until the lockout is cleared or power is reset. This condition may occur when the burners fail to ignite, the flame is not properly detected, or another fault interrupts the heating sequence. Common causes include ignition system problems, interrupted gas supply, a dirty flame sensor, or issues with other safety controls. The lockout is a protective feature designed to prevent repeated failed ignition attempts and help ensure safe furnace operation. The underlying cause should be identified and corrected before returning the furnace to normal service.

Symptoms You May Notice

• The furnace does not produce heat.
• The status LED flashes Error Code 14.
• The furnace attempts to start but shuts down.
• The burners may fail to ignite or remain lit.
• The furnace enters lockout after repeated startup attempts.

Common Causes

• Dirty flame sensor
• Ignition system failure
• Gas supply interruption
• Faulty gas valve
• Low gas pressure
• Wiring or control board issue
• Repeated failed ignition attempts

Safe Troubleshooting Steps

1. Turn off power to the furnace before performing any inspection.

2. Verify that the furnace gas shutoff valve is fully open.

3. Confirm that the thermostat is calling for heat.

4. Check the air filter and ensure adequate airflow.

5. Restore power and allow the furnace to attempt another heating cycle.

6. If Error Code 14 returns, discontinue troubleshooting and contact a qualified HVAC technician.

Parts Commonly Involved

• Flame sensor – Confirms that burner flame is present after ignition.

• Igniter – Lights the burners at the beginning of each heating cycle.

• Gas valve – Controls the flow of natural gas or propane to the burners.

• Control board – Monitors the ignition sequence and places the furnace into lockout after repeated failures.

• Wiring harness – Connects the ignition and safety components to the control board.

When to Call a Technician

If Error Code 14 returns after completing the recommended homeowner checks, professional diagnosis is required. Repeated ignition failures may involve the ignition system, gas supply, flame sensing components, or electrical controls.

Call a qualified HVAC technician if:

• The furnace repeatedly enters lockout.
• The burners fail to ignite.
• The burners ignite but quickly shut off.
• You suspect a problem with the gas supply.
• Electrical testing or component replacement is required.

Safety Notice

Error Code 14 indicates repeated failed heating attempts and an automatic safety lockout. Do not continue resetting the furnace if the code repeatedly returns. If you smell natural gas, leave the area immediately and contact your gas utility or emergency services before attempting any further troubleshooting.

Manufacturer Documentation