Safety first: Turn off power and gas. Flue pressure issues can affect safe venting of combustion gases.

Step 1 – Inspect pressure sensor tubing: Locate the flue/air pressure sensor and its tubing. Ensure tubing is connected to the correct ports and is not kinked, cracked, or filled with condensate.
Step 2 – Clear reference port: Some sensors have a vent or reference port that must remain open. Make sure it is not blocked by dust or insulation.
Step 3 – Check wiring: Verify the sensor’s electrical connector is fully seated and that wires are not damaged.
Step 4 – Reset and test: Restore power and reset the boiler. If E14 returns immediately, the sensor or control calibration may be faulty.
Step 5 – Replace sensor / control (pro): A technician should verify sensor output with a manometer and meter. Replace the flue pressure sensor or control board as indicated by diagnostics.

Warning: Do not alter venting or bypass safety sensors to clear this code; improper venting can cause carbon monoxide poisoning.

Boiler displays E14 and shuts down; often associated with flue or air pressure sensor calibration issues on advanced models.

Possible Causes