Annual gas fireplace service for Southside Greenville homes — gas valve type identified and function-tested during every visit. The gas valve is the central component of a gas fireplace: it must open reliably on demand and seat fully gas-tight on shutoff. A valve that does not close completely is a condition requiring immediate attention. Scope confirmed before work begins.
The gas valve controls all gas flow through a gas fireplace — to the pilot and to the main burner. Valves in gas fireplaces fall into two categories based on how they are powered. Identifying the valve type during annual service determines what connections and power sources to inspect and test.
Self-powered — no household electricity required
Transformer-powered — requires household electricity
The first valve in the series — held open by thermocouple electromagnet output while the pilot burns. Closes automatically when pilot is extinguished, cutting gas to both the pilot and main burner. The fundamental safety mechanism of the gas fireplace: pilot out = all gas off.
Downstream of the safety valve — only receives gas when the safety valve is open and the pilot is burning. Opened by the wall switch, remote, or thermostat signal (millivolt or 24V depending on valve type). This valve controls the flow of gas to the main burner ports beneath the log set.
Built into the combination valve body — reduces the incoming gas supply pressure to the correct operating pressure for the burner. Most residential gas fireplaces operate at 3.5" water column on natural gas or 10–11" water column on propane. The regulator is set at the factory and not adjusted during routine service.
A mechanical knob on the valve body that bypasses all electronic control — allows the fireplace to be operated manually by holding the knob in the pilot or on position. Also used during service for testing valve function independent of the control system. The manual knob is confirmed to rotate freely and return to off during annual service.
A small calibrated orifice inside the valve body meters gas flow to the pilot assembly — controls pilot flame size. Pilot orifice blockage from debris produces a very small or unstable pilot flame, which in turn produces low thermocouple and thermopile output. Cleared with compressed gas if partially blocked.
The valve receives gas from the home supply line through a threaded fitting connection and delivers gas to the pilot tubing and main burner through additional threaded fittings. All fitting connections are leak-tested with soapy solution during annual service — any bubbling at a fitting indicates a leak requiring immediate attention.
All threaded gas fittings at the valve body sprayed with soapy solution — bubbles at any fitting indicate a gas leak requiring immediate service. Includes supply fitting, pilot tubing, and main burner tube connections.
Pilot lit and igniter button released after appropriate warm-up time — confirmed that safety valve holds open on thermocouple signal without button held. A valve that requires the button to be held continuously has failed this test.
Wall switch or remote operated with pilot burning — confirmed that main burner ignites promptly and produces full-width flame across burner. Slow or partial response noted.
Fireplace shut off via switch/remote — confirmed that main burner extinguishes completely and no residual flame or gas odor present after shutoff. Full shutoff confirmed before service complete.
Manual valve knob on valve body confirmed to rotate to pilot, on, and off positions without binding. Returns to off when released. Important that manual shutoff is functional in case electronic control fails.
For 24V AC systems: transformer output measured with voltmeter and confirmed within specification. For millivolt systems: thermocouple and thermopile output confirmed adequate (see millivolt testing page).
For units with an ignition control board: diagnostic LED checked for stored error codes after service sequence complete. Error codes documented and explained to homeowner.
Valve age, type, and condition noted in written service report. Valves showing any functional irregularities documented with recommended action — replacement or continued monitoring depending on severity.