Local gas fireplace repair with a free inspection in West Colonial

Direct vent, B-vent or a log set

Three quite different gas appliances can sit behind a fireplace opening, and each is serviced to its own instructions. A sealed front, a draft hood and an open firebox fail in different ways, so a check that fits one can mislead on another.

One direct vent manual puts the difference plainly. Its units draw all of their combustion air from outside through the vent pipe, while the natural vent units in a companion manual must be installed with the draft hood in the same air pressure zone as their combustion air inlet.

At the start of a visit in West Colonial, the appliance type is the first thing named on the estimate. Vent-free units are routed to our ventless gas fireplace service, and the three types this repair service covers are these.

• A direct vent unit with a sealed glass front
• A natural vent, or B-vent, unit with a draft hood
• A decorative gas log set in a fireplace built for wood

A pilot starved by a dirty orifice

The pilot runs through a tiny opening called the orifice, or spud. It passes only a small flow of gas, so dust, cobwebs or corrosion can starve it, and the result is a pilot that is weak, lazy or will not light at all.

Several complaints trace back here. A pilot too small to reach the thermopile, an electronic pilot that sparks but will not catch, or a flame rod that never sees enough flame can all start with a partly blocked orifice. One electronic ignition chart asks whether the pilot orifices are blocked, and one owner's manual has the technician clean or replace the orifice spud as needed.

We clean or replace it as the manual for that model describes, keep the pilot air opening clear and recheck the flame pattern afterward. A corroded spud becomes its own estimate line.

Control module fault codes and lights

Electronic controls on the models we have read report their own faults with a light and sometimes a beep. Heat & Glo's IntelliFire Touch module, for example, blinks a red and green code with a beep when it locks out.

Each maker prints its own chart, so a code is read only against the chart for that exact control. A code also narrows the fault without finishing the job, since a spark fail still needs the wire, electrode and module checked.

Our technician notes the code at your West Colonial home, confirms the cause behind it and lists that cause on the estimate. One maker's command center flashes its LED in a different pattern for faults such as these.

• Spark fail
• No sensor signal
• Pilot lockout after a failed trial or a lost flame
• Low battery or low thermopile power

The gasket that seals the glass to the firebox

On a direct vent fireplace the glass front is part of a sealed system. Manufacturer instructions for one direct vent line warn that combustion leakage can occur if the glass door is not properly seated and sealed, which makes the seal a safety part rather than trim.

The gasket is the soft seal between the glass frame and the firebox. A gasket that is torn, flattened or pulled away from the frame cannot close that gap. An insert owner's manual lists a gasket seal and glass assembly inspection among the yearly tasks for a qualified service technician, including a check that the glass is properly retained and its frame is undamaged.

We follow the gasket around its full length and look at how the frame sits against the firebox when the latches close. A gasket or glass assembly that needs replacing becomes a glass replacement job and shows on your estimate as its own line, apart from any repair to the burner or controls.