Utica Dunkirk E62

What does Utica Dunkirk E62 mean?

E62 is stored in the fault history when the boiler's combustion control detects wind-induced back-pressure and responds by increasing the fan speed above its normal minimum. The anti-wind function is active, meaning the vent terminal positioning is exposing the flue outlet to prevailing wind. This code does not cause a shutdown but signals an ongoing combustion compensation issue.

Symptoms

• E62 appears in the installer fault-history log rather than as a live lockout.
• Fan runs at higher-than-normal speed during heating or hot-water demand cycles.
• Combustion noise or minor flame instability during windy weather.
• E63, E65, or E67 may accompany E62 if wind exposure is severe.

Common causes

• Flue terminal is positioned in a location subject to direct wind impingement.
• Flue duct terminal cap is damaged, missing, or incorrectly oriented.
• Flue duct run is too long or has too many elbows, increasing system resistance.
• Flue recirculation — exhaust gases re-entering the air intake at the terminal.

Diagnostic steps

1. 01

   Check flue terminal position

   Inspect the outdoor vent terminal. Verify it is installed per the manufacturer's clearance and orientation requirements and is not within a wind-shadow zone or corner of the building.

2. 02

   Inspect the terminal cap

   Confirm the terminal cap is intact, unobstructed, and correctly oriented. Replace a damaged or non-OEM cap that may not provide adequate wind protection.

3. 03

   Check for flue gas recirculation

   With the boiler running, visually inspect whether flue exhaust is re-entering the combustion air inlet at the terminal. Reposition the terminal or extend the flue if recirculation is confirmed.

4. 04

   Review fault-history companion codes

   Pull the full fault history and note whether E63, E65, E67, or E69 appear alongside E62. Multiple anti-wind codes indicate persistent rather than occasional wind exposure.

5. 05

   Verify flue duct dimensions

   Confirm flue length and elbow count are within the manufacturer's specifications for the installed boiler model. Excessive resistance magnifies wind sensitivity.

When to call a professional

Call a licensed technician if flue terminal repositioning or replacement is required, or if the vent run needs to be extended or rerouted. Changes to the sealed combustion air and flue system must comply with local codes and manufacturer guidelines. Improper vent modifications risk flue gas spillage and carbon monoxide exposure.