King, Pierce & Snohomish Counties, WA
Gas Fireplace Pilot Light Repair
Pilot won't light, won't stay lit, or keeps going out? We find the cause and fix it — same visit in most cases, with thermocouples and pilot parts on the truck.
What Your Pilot Is Telling You
The failure pattern usually points at the cause. Find your symptom:
| Symptom | Most Likely Cause | The Fix |
|---|---|---|
| Lights, then dies when you release the knob | Failing thermocouple | Replace thermocouple |
| Holds for minutes or hours, then drops out | Weak thermopile or draft | Test output, replace or seal |
| Flame is small, yellow, or flickering | Dirty pilot orifice | Clean and adjust assembly |
| Won't light at all, no gas sound | Gas supply or valve issue | Check shutoffs, test valve |
| Main burner works, but wall switch/remote is dead | Thermopile too weak to power controls | Replace thermopile |
Common Causes of Pilot Light Problems
In most cases, a pilot that won't stay lit traces back to one of a handful of components. We carry the most common parts on the truck, so once we find the cause we can usually fix it the same visit.
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Faulty thermocouple (most common) — The thermocouple sits directly in the pilot flame and generates a small voltage that tells the gas valve it's safe to stay open. When it wears out, shifts out of position, or gets coated with oxidation, that voltage drops below what the valve needs — so the valve closes and the pilot dies, even if the flame looked fine to you a moment ago.
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Weak thermopile — The thermopile is a set of thermocouples wired in series that generates the millivoltage powering the gas valve and the whole control system — wall switches, remotes, all of it. As it ages or accumulates buildup, the output voltage falls. Once it drops too low, the valve won't stay open reliably, and you'll see the pilot die mid-cycle or refuse to hold after relighting.
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Dirty or clogged pilot orifice — The pilot orifice is a tiny brass fitting that controls exactly how much gas reaches the pilot. Dust, spider webs, and mineral deposits can partially block it over time, and the result is a weak or flickering flame that can't heat the thermocouple enough to hold the valve open. The safety system shuts the gas off — but the real cause is just a dirty fitting that needs to be cleaned.
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Draft issues pulling out the flame — The pilot flame is small and pretty vulnerable to air movement. Air sneaking in from a poorly sealed firebox, an open or improperly dampered flue, or pressure shifts from nearby exhaust fans can push just enough air across the pilot to put it out — and it'll happen over and over even when every component tests perfectly fine. Draft is one of the trickier causes to catch.
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Low gas pressure — The pilot needs enough gas pressure to produce a flame hot enough to satisfy the thermocouple. If pressure is too low — a partially closed shutoff, a regulator problem, or something at the meter — the flame stays weak and the valve cuts off, even if the thermocouple itself is perfectly fine. It's less common than the other causes, but worth checking when everything else tests out.
How We Diagnose Pilot Light Issues
- 1Observe the pilot behavior — We watch the pilot through a full ignition cycle and note exactly when it fails. Does it light and immediately drop? Hold for a few seconds, then die? Each pattern tells us something different about where to look next.
- 2Test thermocouple and thermopile output with a multimeter — We put a millivolt meter on both components under load. If the reading is outside the acceptable range, we've confirmed the failure — no guessing, no replacing parts that didn't need it.
- 3Inspect gas flow and pressure — We check the pilot orifice for blockage, verify gas pressure at the valve, and make sure nothing upstream is cutting the supply short. When the thermocouple and thermopile test fine, this step usually pinpoints the cause.
How to Relight Your Pilot Safely
Trying once yourself is reasonable. Your unit's exact steps are on the access panel or in the manual, but the standard standing-pilot procedure is:
- 1Turn the gas control knob to OFF and wait 5 minutes for any gas to clear. If you smell gas after waiting, stop — don't relight. Ventilate and call a technician or your gas utility.
- 2Turn the knob to PILOT, press it in, and hold — this sends gas to the pilot only.
- 3While holding the knob, press the igniter button (or apply the flame per your manual) until the pilot lights.
- 4Keep holding the knob 30–60 seconds after the flame appears — this heats the thermocouple so the valve stays open — then release and turn to ON.
If it holds for an hour, you likely had a one-time event and the fireplace is fine. If it dies again within the hour — or dies the moment you release the knob — stop. Repeated relighting just wears down a thermocouple that's already failing, and a failing thermocouple doesn't recover. That's the point to call.
Does Your Fireplace Have a Pilot Light?
Pilot light problems only occur in fireplaces with a standing pilot — a small flame that burns continuously whenever the fireplace is in standby. If you've got one, you can see it through the access panel below the firebox even when the fireplace is off.
Standing pilot systems (this page applies to you):
- ✓ Pilot flame burns 24/7 — visible through the access panel when the fireplace is off
- ✓ Common in units manufactured before the mid-2000s
- ✓ Has a thermocouple or thermopile — the primary parts that fail and cause pilot outages
- ✓ Can be relit manually using the valve knob on the gas assembly
If your fireplace doesn't have a standing pilot — if it sparks on demand when you press the igniter button or use a wall switch — you have an intermittent pilot ignition (IPI) or electronic ignition system. Those systems have no pilot to relight; when they fail, it's usually a spark module, igniter, or flame sensor. See our Gas Fireplace Ignition Repair page for that type of diagnosis.
Service Area
We provide pilot light repair service throughout King County, Pierce County, and Snohomish County — including Seattle, Bellevue, Tukwila, Renton, Kent, Kirkland, Redmond, Federal Way, Tacoma, Everett, and surrounding communities.
Frequently Asked Questions
Why does my gas fireplace pilot light keep going out?
Nine times out of ten it's a failing thermocouple or thermopile — the safety components that signal the gas valve it's okay to stay open. When they wear out or their millivoltage output drops, the valve closes and the pilot dies. A dirty pilot orifice can cause the exact same symptom by weakening the flame itself rather than the sensing side. Draft from a poorly sealed firebox or nearby ventilation equipment is another culprit that's easy to miss. We can usually narrow it down to one cause in a single trip with a multimeter.
Can I relight the pilot myself?
Sure — give it one try. Follow the instructions on the access panel or in your owner's manual and let it run for a full hour to see if it holds. If it goes out again within that hour, or you've already tried twice and it won't stay lit, stop and call us. Repeated relighting won't fix a failing thermocouple — it just delays the repair and burns gas for nothing. At that point you need a part replaced, not another relight attempt.
How long does pilot light repair take?
Most pilot light repairs wrap up in a single visit, usually within an hour or two. We stock thermocouples, thermopiles, and pilot orifice parts for the most common fireplace brands on every truck — so once we've found the problem, we can almost always fix it right then. The occasional exception is a special-order part for a less common or older unit, which means a return visit, but that doesn't come up often.
Is a pilot light problem dangerous?
A pilot that won't stay lit is frustrating, but in most cases it's not a hazard — the safety system is doing exactly what it's supposed to do. That said, if you smell gas at any point, hear hissing near the fireplace, or the pilot keeps going out after relighting with no obvious explanation, stop trying to relight it and call us. Don't let gas accumulate while you troubleshoot. If you smell gas strongly, leave the house and call your gas utility first.
Does a standing pilot use a lot of gas?
A standing pilot burns continuously, so yes, it does use a small amount of gas around the clock. Over a full heating season that adds up, which is why a lot of homeowners shut the pilot off in spring and relight it in the fall. If efficiency matters to you, some units can be converted from a standing pilot to an electronic intermittent ignition system that only fires when you actually want heat. Ask us if your unit is a good candidate for that conversion.
My pilot light is blue — is that normal?
Yes, blue is exactly what you want. It means clean combustion with the right air-to-gas mix. A yellow or orange pilot flame is a different story — that tells us the mixture is off, usually from a dirty or partially blocked orifice or a restricted combustion air path. Yellow flames also burn cooler, which can cause thermocouple problems even when the thermocouple itself is perfectly fine. If your pilot is yellow, it needs to be cleaned and adjusted, not just watched.
Pilot Light Issues? Call Us Today.
Call or text us now or request a free estimate online — we respond fast and carry parts for most common brands.
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