Sioux Falls Gas Fireplace Repair Pilot Light and Ignition Repair in Sioux Falls
When a gas fireplace pilot will not light, will not stay lit, or an electronic unit clicks and gives up, the fix is usually one part: a thermocouple, a thermopile, the pilot assembly, the flame sensing rod or the ignition board. In Sioux Falls a thermocouple or thermopile typically runs $200 to $400 installed, a full pilot assembly $300 to $600, and an electronic ignition module or control board $350 to $700. We test the circuit before we replace anything, and the firm price follows that test.
Standing pilot or electronic ignition
The first question is which system you have. The rating plate and the controls tell us.
| Standing pilot (millivolt) | Electronic ignition (IPI) | |
|---|---|---|
| Pilot | Burns all the time once lit | Lights only when you call for heat |
| Safety sensor | Thermocouple | Flame sensing rod |
| Power for the valve | Thermopile makes its own | Board, with house power or batteries |
| Typical failure | Weak sensor, dirty pilot | Dirty rod, board lockout, weak spark |
| Typical repair | $200 to $600 installed | $350 to $700 installed |
Some units can do both. Napoleon’s B36 has a switch that selects continuous pilot with timer or intermittent pilot ignition.
House age is a rough hint. In Harrisburg about 70.8% of homes were built in 2000 or later, and in Tea about 52.7% (Census ACS 2023), so many fireplaces there are newer units, and many of those use electronic ignition. Older homes in Sioux Falls, Lennox and Dell Rapids more often have standing pilots, but plenty have been swapped out, so we never assume.
Standing pilot parts
Thermocouple. A thermocouple makes a small voltage when the pilot heats its tip, and that voltage holds the safety valve open. When it weakens, the pilot lights while you hold the knob and goes out when you let go. Napoleon specifies a fast acting thermocouple supplied by Wolf Steel on its GD33, which is why we match parts to the model rather than fitting a generic one.
Thermopile. The thermopile powers a millivolt valve, so the pilot can stay lit while the main burner will not come on. Napoleon’s troubleshooting list names a pilot flame not engulfing the thermopile, or a thermopile shorting, as causes when the main burner goes out and the pilot stays on.
Pilot assembly. Dust and lint in the pilot hood can weaken the flame until it no longer wraps the sensors. Napoleon’s manual says the flame must envelop the upper 3/8 to 1/2 inch of the thermocouple and thermopile. Sometimes cleaning fixes it; when the hood, orifice or tubing is worn, we replace the assembly.
Electronic ignition parts
Flame sensing rod. The board needs to see the flame through this rod. Heat & Glo’s annual service list includes inspecting the IPI flame sensing rod for soot, corrosion and deterioration, polishing it with fine steel wool or replacing it.
Ignition board or module. Napoleon’s B36 manual says the board starts sparking after about 4 seconds, tries for about 60 seconds, and goes into lockout if it senses no flame. A board that locks out every time can be the board itself, or a rod, spark or gas pressure problem it is reacting to. We check those first.
Safe relighting
Follow the lighting card on the unit. Napoleon’s millivolt valves have an interlock that waits about 60 seconds for the thermocouple to cool. Heat & Glo says do not reset the module more than once within five minutes. If you smell gas at any point, stop, leave the house and call MidAmerican Energy, or Crooks Municipal Gas in Crooks and Renner, and 911 from outside.
More help: pilot will not stay lit, flame goes out and relights, the gas valve page for when the valve is the problem, and every typical range on our pricing page.
Frequently Asked Questions
Why will my fireplace pilot not stay lit after I let go of the knob?
On a standing pilot that usually means the thermocouple is not holding the safety valve open, either because the sensor is worn or because the pilot flame is too small or dirty to heat it. Napoleon's GD33 manual says the flame must envelop the upper 3/8 to 1/2 inch of the thermocouple and thermopile. A thermocouple or thermopile typically runs $200 to $400 installed.
How long should I wait before trying to relight the pilot?
Follow the lighting card on your unit. Napoleon's millivolt valves have an interlock that will not let the pilot relight until the thermocouple cools, and the manual says to allow about 60 seconds. Heat & Glo says not to reset its control module more than once within five minutes, because gas may build up in the firebox.
My electronic fireplace clicks and then stops. What is that?
On many electronic units the board sparks for a set time, and if it does not sense a flame it stops and locks out. Napoleon's B36 manual puts that attempt at about 60 seconds. The usual causes are a dirty flame sensing rod, a weak spark, low gas pressure or a failing board. A module or control board typically runs $350 to $700 installed.