69L17 PILOT-ASSY – Natural Gas – Millivolt
69L17 PILOT-ASSY – Natural Gas – Millivolt
✔ In stock — Usually ships in 1–2 business days
What This Part Does
The 69L17 pilot assembly is a Natural Gas millivolt (standing pilot) ignition component responsible for lighting the pilot flame and generating the electrical signal required to operate the gas valve.
In a millivolt (standing pilot) system, the pilot flame heats the thermocouple and thermopile. The thermocouple helps keep the pilot gas flow open for safety, while the thermopile generates the millivolt power used to operate the main gas valve.
When a call for heat is made from a wall switch, thermostat, or remote, the thermopile supplies voltage to the gas valve, allowing it to open and deliver gas to the main burner.
This assembly also includes the pilot burner and ignition source, which are responsible for reliably lighting the pilot flame.
Proper pilot assembly operation is essential for safe ignition, consistent voltage generation, and reliable fireplace performance.
Not sure if this is the right part?
Before ordering, check the following:
- Locate your model number (typically behind the lower louver or inside the control compartment)
- Confirm your unit uses a millivolt (standing pilot) system
- Confirm your gas type is natural gas
- Compare your existing pilot assembly to the images provided
⚠️ This part is NOT for IPI (electronic ignition) systems
⚠️ This part is NOT for propane (LP) units
If unsure, refer to your manual or contact us for help identifying the correct part.
🔁 Using propane (LP) instead of natural gas?
This part will not work. View the correct LP version here: 69L18
Compatible Models
Astria Gas Fireplaces:
Altair40DMN-B
Altair45DMN
Altair45DMN-B
Aries33RMN
Aries33TMN
Aries35RMN
Aries35TMN
Aries40RMN
Aries40TMN
Aries45DMN
AriesCD33TMN
AriesCD35RMN
AriesCD40RMN
AriesCD40TMN
AriesCD45DMN
Gemini33RMN
Gemini33TMN
Gemini35DMN
Gemini40DMN
Gemini45DMN
Libra40CLDMN
Libra40CRDMN
Libra40PFDMN
Libra40STDMN
Marin40STMN
Ironstrike Gas Stoves:
CI1500DVF
CI1502DVF
CI1504DVF
CI1506DVF
CI1508DVF-2
CI2500DVF
CI2502DVF
CI2504DVF
CI2506DVF
CI2508DVF-2
Lennox Gas Fireplaces:
ED4035CNM-2
EDV3530CNM
EDV3530CNM-B
EDV4035CNE
EDV4035CNM
EDV4035CNM-B
EDV4540CNM
EDV4540CNM-B
EDVCLNM
EDVCRNM
EDVPFNM
EDVSTNM
ELDV35NM
ELDV40NM
MLDVT35NM
MPD3530CNM
MPDR3328CNM
MPDT3328CNM
Superior Gas Fireplaces:
BDM35
DR3530CNM-2
DR-400CMN
DR-500CMN
DR-600CMN
DR-800CMN
DRT2035TMN
DT-400CMN
DT-500CMN
DT-600CMN
DT-800CMN
DVPF-RMNS
DVR-5CMNS
DVR-6010CMNS
DVR-6010RMNS
DVST-CMNS
DVT-6010CMNS
DVT-6010RMNS
DVT6-CMNS
DVT6-RMNS
DVT8-RMNS
EBVCLNM
EBVCRNM
EBVPFNM
EBVSTNM
ED3530CNM
ED4540CNM-2
EDCLNM-2
EDCRNM-2
EDPFNM-2
EDSTNM-2
ELDV45NM
LMDV-3530CNM
LMDV-4035CNM
LMDVR-3328CNM
LMDVT-3328CNM
MLDVT-30NM
MLDVT-35NM
MLDVT-40NM
MLDVT-45NM
MPB-3328CNM
MPB35ST-NM
MPD-3530CNM
MPD3530CNM-B
MPD35ST-NM
MPD-4035CNM
MPD4035CNM-B
MPD-4540CNM
MPD4540CNM-B
MPD5330CNM
SDDV-35NM
SDDV-40NM
SLDVT-35NM
SSBV-3530CNM
SSBV-4035CNM
SSDVPF-CNM
SSDVR-3328CNM
SSDVR-3530CNM
SSDVR-4035CNM
SSDVST-CNM
SSDVT-3328CNM
SSDVT-3530CNM
SSDVT-4035CNM
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.