What the Error Code Means
Error code 14 generally means the furnace could not complete a safe start and shut down.
It reflects a safety lockout rather than a single confirmed failure.
Common Symptoms You May Notice
- The furnace attempts to start but stops before producing heat.
- You may hear the system cycle on and off without steady heat.
- You see the 14 code flashing on the control panel or indicator light.
Most Common Causes (From Least to Most Serious)
- Thermostat or power interruption: A brief power interruption or thermostat issue can interrupt startup and trigger the code.
- Airflow is restricted: A dirty filter or blocked vents can prevent normal operation and cause a safety stop.
- Startup conditions are outside the expected range: In many cases the furnace pauses when it cannot confirm normal start conditions.
Safe Things You Can Check Yourself
- Confirm the thermostat is set to heat and the temperature is set above the room temperature.
- Check that the furnace power switch is on and the unit has power.
- Replace or clean the furnace filter if it looks dusty or clogged.
If at any point this feels unsafe or unclear, stop and contact a professional.
When to Stop and Call for Service
- The code returns after a reset or the furnace will not start consistently.
- You smell gas, see smoke, or notice repeated shutdowns.
- The furnace still will not heat after basic checks.
Typical Repair Cost Range
$150-$450 is typical for diagnosis and service to address furnace startup lockouts, depending on the cause and parts involved.
Costs vary by region, model, and provider. Request an estimate before approving any repair.