446-513A PILOT ASSEMBLY – Propane – Millivolt

Compatible Models

Heat-N-Glo Gas Fireplaces:
36DV88
4000GDV
4000GDVLP
4000INC
4000INC-NF
4000INS
4000INS-NF
4000TV
4000TV-HSI
4000TVLP
4000TVLP-HSI
4000WH
4000WH-CGA
4000WHMH
5000GDV
5000GDVC
5000GDV-CDA
5000GDVCLP
5000GDVD
5000GDV-DSI
5000GDV-HK
5000GDV-HSI
5000GDVLP
5000GDVLP-CDA
5000GDVLP-DSI
5000GDVLP-HSI
5000GDVMH
5000GDV-NF
5000TV
5000TV-HSI
5000TVLP
5000TVLP-HSI
6000ARCH
6000ARCHLP
6000CF
6000CF-DSI
6000CFLP
6000CFLP-DSI
6000DVT
6000DVTFL
6000DVTFLLP
6000DVTFLLP-NF
6000DVTFL-NF
6000DVT-HSI
6000DVTLP
6000DVTLP-HSI
6000FLS
6000FLSLP
6000GDV
6000GDV-CGA
6000GDVFL
6000GDVFL-DSI
6000GDVFLLP
6000GDVFLLP-DSI
6000GDVFLLP-NF
6000GDVFL-NF
6000GDV-HSI
6000GDVLP
6000GDVLP-CGA
6000GDVLP-HSI
6000SGDV
6000SGDVLP
6000TV
6000TVFL
6000TVFL-DSI
6000TVFLLP
6000TVFLLP-DSI
6000TVFLLP-NF
6000TVFL-NF
6000TVFL-NF-DSI
6000TV-HSI
6000TVLP
6000TVLP-HSI
8000DVT
8000DVTFL
8000DVTFL-DSI
8000DVTFLLP
8000DVTFLLP-DSI
8000DVT-HSI
8000DVTLP
8000DVTLP-DSI
8000DVTLP-HSI
8000GDV
8000GDVFL
8000GDVFL-DSI
8000GDVFLLP
8000GDVFLLP-DSI
8000GDV-HSI
8000GDVLP
8000GDVLP-HSI
8000TV
8000TVFL
8000TVFL-DSI
8000TVFLLP
8000TVFLLP-DSI
8000TVLP
BAY-30
BAY-30-DSI
BAY-GDV
BAY-GDV-95
BAY-GDV-DSI-95
BAY-GDVLP
BAY-GDVLP-95
CFX-36TSP
GAS36TV
GAS36TVLP
GRAND-50
L-CORNERDV
L-CORNERDV-HSI
L-CORNERDVLP
L-CORNERTV
L-CORNERTV-DSI
L-CORNERTV-HSI
L-CORNERTVLP
PIER-DVT
PIER-DVT-HSI
PIER-DVTLP
PIER-DVTLP-HSI
PIER-GDV
PIER-GDV-CGA
PIER-GDV-HSI
PIER-GDVLP
PIER-GDVLP-CGA
PIER-GDVLP-HSI
PIER-TR
PIER-TR-DSI
PIER-TRLP
PIER-TRLP-DSI
PIER-TV
PIER-TV-DSI
PIER-TV-HSI
PIER-TVLP
PIER-TVLP-DSI
PIER-TVLP-HSI
R-CORNERDV
R-CORNERDV-HSI
R-CORNERDVLP
R-CORNERTV
R-CORNERTV-DSI
R-CORNERTV-HSI
R-CORNERTVLP
SL-2000
SL-2000LP
SL-32
SL-32-CDN
SL-32-DSI
SL-32LP
SL-32LP-CDN
SL-32LP-DSI
SL-36
SL-36-CDN
SL-36-DSI
SL-36LP
SL-36LP-DSI
SL-36LP-NF
SL-36-NF
SL-36-PB
SL-36TV
SL-36TVLP
SL-36TVLP-PB
SL-36TV-PB
SL-42TV
SL-42TV-DSI
SL-42TVLP
SL-42TVLP-DSI
SL-5500S
SL-TVBLD
SL-TVBLD-DSI
SL-TVBLDLP
SL-TVBLDLP-DSI
ST-38GTV
ST-38GTV-DSI
ST-38GTVLP
ST-38GTVLP-DSI
ST-42FL
ST-42FL-DSI
ST-42FLLP
ST-42FLLP-DSI
ST-42GTV
ST-42GTV-HSI
ST-42GTVLP
ST-42GTVLP-HSI
ST-CFL-24NG
ST-DVT
ST-DVT-HSI
ST-DVTLP
ST-DVTLP-HSI
ST-FLS
ST-GDV
ST-GDV-CGA
ST-GDV-HSI
ST-GDVLP
ST-GDVLP-CGA
ST-GDVLP-HSI
ST-GLS
ST-TR
ST-TR-DSI
ST-TRLP
ST-TRLP-DSI

Heat-N-Glo Gas Inserts:
4000INCLP
4000INCLP-NF
4000INSLP
4000INSLP-NF
BAY-INSERT
BAY-INSERT-DSI
BAY-INSERTLP
DVT-INSERT
DVT-INSERTLP
DVT-INSERTMH
SL-INSERT
SL-INSERT-B
SL-INSERTLP
SL-INSERTLP-B

Heat-N-Glo Gas Log Sets:
CFL-18LP
CFL-18LP-B
CFL-18NG
CFL-18NG-B
CFL-24LP
CFL-24LP-B
CFL-24NG
CFL-24NG-B
CFL-30NG-B
GES-100NG
GLS-18NG
GLS-24NG
ST-CFL-24LP

Heat-N-Glo Gas Stoves:
4000WH-HSI
4000WHLP
4000WHLP-CGA
4000WHLP-HSI
BAY-STOVE
BAY-STOVELP
DVT-STOVE
DVT-STOVELP
GS-4000

System Type

This is a millivolt standing pilot system. These systems use a continuously burning pilot flame and do not require household electrical power for basic operation.

Millivolt systems are commonly found in many direct vent gas fireplaces and are known for simple, reliable operation.

This system commonly includes:

• Thermocouple — helps keep the pilot gas valve open when the pilot flame is proven.
• Thermopile — generates millivolt power used to operate the main gas valve.
• Igniter electrode — provides manual spark ignition, usually from a push-button piezo igniter.
• Pilot tube — delivers gas from the valve to the pilot assembly.

Because these systems do not rely on external power, they can often operate during a power outage when used with a manual switch or compatible battery-free control setup.

These systems offer improved efficiency, remote-control compatibility, and added safety features, but they also include more electronic components than a millivolt system.

Common Problems This Part Fixes

If your fireplace uses a millivolt (standing pilot) system, the pilot assembly is responsible for generating the voltage needed to operate the gas valve and proving flame safety. When it begins to fail, it can cause a range of ignition and operating issues.

Replacing the pilot assembly often resolves the following problems:

• Pilot will not stay lit
  A weak or failing thermocouple may not keep the gas valve open.
• Pilot lights but goes out when the knob is released
  The thermocouple is not properly generating or delivering a safety signal.
• Pilot flame is weak, small, or unstable
  A clogged pilot orifice or worn components can affect flame quality.
• Burner will not turn on even though pilot is lit
  A weak thermopile may not generate enough voltage to operate the valve.
• Intermittent operation or delayed burner ignition
  Inconsistent voltage output from the pilot assembly can cause unreliable performance.
• No response from wall switch or remote
  Insufficient millivolt output can prevent the system from activating.
• Difficulty lighting the pilot
  A worn igniter electrode or misaligned pilot components can prevent proper ignition.

Important Note

Many of these symptoms can also be caused by a faulty gas valve, loose wiring, or improper gas pressure. Proper diagnosis is recommended before replacing the pilot assembly.

Warranty Information

This product includes a 12-month warranty from the date of purchase. This warranty covers defects in materials or workmanship under normal operating conditions.

Fireplace components must be properly installed and matched to the correct system (millivolt vs IPI, natural gas vs propane).

This warranty does NOT cover:
• Improper installation or incorrect application
• Use with the wrong gas type (NG vs LP)
• Misdiagnosis of the issue
• Damage caused by other failing components
• Normal wear and tear
• Labor, service, or diagnostic time

Because many fireplace issues can be caused by multiple components, we strongly recommend confirming the diagnosis before replacing parts.

We are happy to assist with this. Proof of purchase is required for all warranty claims. Please contact us prior to removal or replacement of the part so we can help verify the issue and guide the warranty process.

Do I need any special tools to install this?

Most pilot assemblies can be installed using basic hand tools, and no specialized equipment is typically required.

In most cases, you will need:

• Adjustable wrench or open-end wrenches
• Screwdrivers (Phillips and/or flathead)
• Nut driver or socket set

The pilot assembly is usually mounted near the burner and connected by a pilot tube and thermocouple or thermopile. Installation involves removing the old assembly, reconnecting the gas line components, and securing the new pilot in place.

It is important to ensure all connections are tight and properly aligned. After installation, always check for gas leaks using a leak detection solution and confirm proper pilot flame appearance.

If you are unsure or uncomfortable working with gas components, we recommend having a qualified technician perform the installation to ensure safe and proper operation.

Do I need to make any adjustments after installation?

In most cases, no major adjustments are required after installing a pilot assembly, but a few important checks should always be performed to ensure proper operation.

After installation, you should:

• Verify the pilot flame is steady and properly positioned over the thermocouple or flame sensor
• Confirm the flame is strong enough to fully engulf the sensor (not weak or lifting)
• Check all gas connections for leaks using a leak detection solution

Some systems may include a pilot adjustment screw on the gas valve. If needed, this can be used to fine-tune the pilot flame height, but many modern systems are preset and do not require adjustment.

If the pilot flame appears weak, unstable, or does not stay lit, this may indicate an issue with gas pressure, air in the line, or another component in the system.

Proper flame appearance and stable operation are key to safe and reliable performance. If you are unsure about flame characteristics or adjustments, we recommend consulting a qualified technician.

How difficult is this part to replace?

Replacing a pilot assembly is generally considered a moderate repair and can often be completed by a homeowner with basic mechanical skills.

The process typically involves accessing the burner area, disconnecting the pilot tube and sensor leads, removing the old assembly, and installing the new one in the same position.

While no specialized tools are usually required, the work does involve gas connections and components that must be installed correctly to ensure safe operation.

For someone comfortable working with hand tools and following instructions carefully, this is a manageable repair. However, access to the pilot assembly can vary depending on the fireplace model, and some units may require additional disassembly.

If you are unsure about working with gas systems or identifying proper flame characteristics after installation, we recommend having a qualified technician perform the replacement.

How do I know if my pilot assembly is bad?

A bad pilot assembly will usually show clear symptoms related to ignition problems or unstable flame performance.

Common signs of a faulty pilot assembly include:

• Pilot will not light at all
• Pilot lights but will not stay lit
• Weak, small, or flickering pilot flame
• Pilot lights but the main burner does not turn on
• Intermittent operation or frequent shutdowns

In many cases, the issue is caused by a worn or failing thermocouple or thermopile, a clogged pilot hood, or a damaged ignition component. Dirt, dust, or corrosion can also affect how the pilot flame contacts the sensor.

A proper pilot flame should be steady, strong, and fully engulf the thermocouple or flame sensor. If the flame is weak, not making good contact, or going out unexpectedly, the pilot assembly may need to be cleaned or replaced.

Before replacing the assembly, it is also important to rule out other possible causes such as low gas pressure, air in the gas line, or a faulty gas valve.

If cleaning does not resolve the issue or the components show signs of wear or damage, replacing the pilot assembly is often the most reliable solution.