Gas Fireplace Diagnostics and Troubleshooting

Cause

Remedy

Draft Spill Switch open.

Your gas fireplace may be equipped with a draft switch. These can be a manual reset or auto reset.

Check the vent cap for damage or bent to one side. A bent cap can cause a down draft

Cause

Remedy

Low voltage to the gas valve

Weak Thermopile Generator. Generator output is less than 500 mv.

Poor connection on the wiring, a dirty or loose connection will cause an excessive voltage drop, stealing power from the gas valve. Any wiring connections with marettes should be soldered, crimped with proper connectors, or tightened on a connection block or screw terminal board.

Cause

Remedy

Poor Air gas ratio, flame is burning too rich

Flame is burning too rich increase primary air.

In order to keep the flame as attractive as possible, the primary air is kept to a minimum. Dirt build up around the air intake, dirty burners or operation at high altitude 2000 ft ++ can cause sooting. Increase primary air by locating the burner inlet and opening the shutter.

It might be a fix inlet with no adjustment and will require gas adjustment or changes to the manifold. Combustion testing equipment is required to make any changes in the gas manifold.