Direct Vent Diagnostic in Clifton, VA

Direct Vent Fireplace Not Working? Here’s What We Found During a Recent Diagnostic

One of the most common questions we hear from homeowners is:

“Why won’t my direct vent fireplace turn on or stay lit?”

Recently, a homeowner in Clifton, Virginia reached out to us after their direct vent fireplace began shutting off unexpectedly. The unit had worked fine in previous seasons, but this year it would ignite briefly and then shut down.

Rather than guessing or replacing parts unnecessarily, we started with a full direct vent fireplace diagnostic.

The Problem

At first glance, the fireplace appeared functional. The pilot would ignite, and the burner would light momentarily. However, the system consistently shut itself down after a short run time.

This is a common symptom of a safety-related issue, not a cosmetic or simple ignition problem.

Our Diagnostic Process

During the inspection, we performed a complete system evaluation, including:

✔ Gas valve and control system testing
✔ Ignition and safety switch inspection
✔ Gas leak detection
✔ Venting and airflow evaluation
✔ Operational flame testing

We identified two contributing issues:

• Restricted airflow caused by venting buildup

• A failing safety sensor triggering automatic shutdown

Neither issue was visible without proper testing equipment and experience working specifically with direct vent systems.

Why Diagnostics Matter

Direct vent fireplaces are designed with multiple safety mechanisms. When something isn’t operating correctly, the system shuts down to prevent unsafe operation.

Homeowners often assume the unit needs to be replaced or that it’s a major repair. In many cases, the real issue is:

• Improper airflow

• Sensor failure

• Gas pressure inconsistencies

• Control system faults

A professional diagnostic pinpoints the exact cause before repairs begin, saving time, money, and frustration.

The Result

After addressing the venting restriction and confirming the sensor failure, we provided clear repair recommendations. The homeowner was able to move forward confidently, knowing exactly what was wrong and why.

Considering an Upgrade Instead of a Repair?

If your direct vent fireplace diagnostic shows that repairs aren’t the best long-term solution, upgrading to a properly installed gas log system may be the right move. Our team provides gas log installation services for homeowners throughout Northern Virginia, with safety and performance as the priority.

Serving Alexandria, Woodbridge, and Surrounding Areas in VA

At Sixpenny Chimney Sweeps, we provide direct vent fireplace repair and diagnostics for homeowners throughout Alexandria, Woodbridge, and surrounding areas in Virginia. Our approach is focused on safety, accuracy, and transparency, not guesswork. If your direct vent fireplace won’t ignite, shuts off unexpectedly, or isn’t burning correctly, a diagnostic is the first and most important step. Schedule a professional direct vent fireplace diagnostic and get clear answers before problems get worse.