Utica Dunkirk E67

What does Utica Dunkirk E67 mean?

E67 is stored in the fault history when the anti-wind function has escalated to maximum power — the fan is running at its highest speed to overcome wind-induced back-pressure at the flue terminal. This is a more severe progression of the E62 anti-wind condition, indicating that normal fan speed compensation has reached its limit without fully restoring combustion stability.

Symptoms

• E67 appears in the fault-history log, often accompanied by E62 or E65.
• Fan audibly runs at maximum speed during burner operation.
• Reduced heating efficiency or intermittent burner operation during high-wind conditions.
• Possible transition to E69 (combustion out of range) if the condition persists.

Common causes

• Flue terminal is exposed to high and sustained wind impingement.
• Flue duct resistance is at or near the maximum allowable for the model, compounding wind sensitivity.
• Flue gas recirculation at the terminal is driving combustion air contamination.
• Damaged or missing vent terminal cap providing no wind protection.

Diagnostic steps

1. 01

   Inspect the flue terminal for wind exposure

   Check the outdoor terminal location. It must not face prevailing winds directly and must meet all manufacturer clearance requirements from walls, eaves, and corners.

2. 02

   Verify terminal cap integrity

   Replace a cracked, missing, or non-standard terminal cap. Use only the manufacturer-approved cap style for this model to ensure proper wind resistance.

3. 03

   Check for flue gas recirculation

   With the boiler running, observe the terminal for exhaust re-entering the intake. Extend or reposition the vent system if recirculation is present.

4. 04

   Measure flue system resistance

   Confirm the total equivalent length of the flue run is within published limits. Reduce unnecessary elbows or increase duct diameter if resistance is excessive.

5. 05

   Review fault-history for E53 and E69

   If E53 or E69 appear alongside E67, the combustion system has exceeded its self-correction range. Perform a full combustion analysis and recalibration after correcting the vent issue.

When to call a professional

Call a licensed technician when E67 appears repeatedly or alongside E69, E53, or E92, as the boiler has reached its maximum anti-wind compensation limit. Combustion analysis, flue reconfiguration, and recalibration require specialized test equipment and factory certification. Unresolved anti-wind faults can lead to unsafe combustion conditions.