WB28K10190 GE oven Left Front Orifice is a precision gas orifice used on GE gas ranges/ovens to meter the flow of natural gas or propane to the left-front burner. The component is a small, typically threaded metal jet that installs between the manifold/valve outlet and the burner tube; its internal bore diameter and thread form determine the volumetric flow rate delivered to the burner port. As a discrete replaceable part, the orifice provides a fixed restriction that, together with supply pressure, establishes the flame size and heat output for that burner position.
Inside the appliance, the left-front orifice interacts directly with the gas manifold, the valve body, the burner head, and the ignition system (spark or hot surface igniter). It functions as part of the fuel delivery subsystem, converting manifold pressure and valve opening time into a controlled gas flow to the burner ports where combustion occurs.Proper orifice sizing and secure installation affect combustion characteristics (flame shape, color, and stability), appliance efficiency, and safe venting of combustion products; it also has implications for cross-burner balance and overall cooktop performance.
In this article, readers will find a technical review of the WB28K10190 orifice’s intended function and where it is typically installed, guidance on verifying compatibility with specific GE models, common failure modes and symptoms (such as weak or yellow flames, uneven heating, ignition problems, and gas odor), methods for basic troubleshooting and inspection, and practical replacement considerations-thread engagement, orifice bore, sealing, and safety precautions when working on the gas system. The emphasis is on diagnostic clarity and correct part selection to support safe, effective repairs or maintenance.
Table of Contents
- Function and Role of the Left Front Orifice in Burner Gas Flow and Flame Control
- How the WB28K10190 GE Oven Left Front Orifice Integrates with the Burner Assembly, Manifold Pressure and Air-Fuel Mixing
- Common Failure Symptoms and Diagnostic indicators of a Defective Left Front Orifice
- replacement Considerations and Installation Procedure for the WB28K10190 Left Front Orifice, Including Sealing and Verification Tests
- Q&A
- in Summary
Function and Role of the Left Front Orifice in Burner Gas Flow and Flame Control
The WB28K10190 GE Oven Left Front Orifice is a precision-machined jet that meters the gas delivered to the left front burner. Installed at the burner inlet,the orifice creates a fixed pressure drop that determines volumetric flow and thus the burner’s heat output and flame shape. Its internal diameter and seat geometry are selected to match the oven/range manifold pressure and the intended fuel type (natural gas or propane), so the correct orifice ensures stable combustion, proper BTU delivery, and predictable burner behavior across the appliance’s control range.
Performance issues commonly trace back to the orifice’s size, cleanliness, or compatibility with the appliance’s regulator and fuel type. A partially blocked orifice reduces flow and yields a weak, lifting, or yellow-tipped flame; an orifice sized for propane used on natural gas (or vice versa) will produce incorrect flame characteristics and unsafe combustion. During service, technicians verify flame color, flame height, and burner response at different valve settings, confirm the manifold pressure, and replace the orifice with an OEM or equivalent unit that matches the appliance model and fuel conversion requirements. Proper seating and torque of the orifice assembly are necessary to prevent leaks and ensure repeatable flow performance.
- Function: meters gas flow to produce the designed BTU output and flame pattern.
- Symptoms of fault: weak flame, yellow tipping, soot, or flame lift/noise.
- Compatibility: must match appliance model, manifold pressure, and fuel type.
- Service tip: inspect for debris, verify manifold pressure, and use correct replacement part.
| Item | Description |
|---|---|
| Function | Fixed metering of gas to the left front burner to control heat output and flame shape |
| Common symptoms | Low flame, yellow flame, sooting, or unstable burner operation |
| Compatibility | Match to appliance model and fuel type; use OEM or specification-equivalent replacements |
How the WB28K10190 GE Oven Left Front Orifice Integrates with the Burner Assembly, Manifold Pressure and Air-Fuel Mixing
The WB28K10190 GE Oven Left Front orifice is a calibrated flow restriction that determines the gas mass flow to the left-front burner under a given manifold pressure. In the burner assembly the orifice sets the upstream pressure drop that, together with the burner venturi geometry and air shutter, establishes the gas jet velocity and the amount of primary air entrained into the burner tube. The orifice thus directly affects flame size, flame shape and combustion quality: for a fixed manifold pressure a larger orifice raises fuel flow and can enrich the mixture, while a smaller orifice reduces flow and leans the mixture. Because the left-front position may have slightly different port geometry or cooking load, the OEM-specified WB28K10190 size matches that burner’s venturi and manifold arrangement to maintain the intended air-fuel ratio and heat output.
- Controls gas flow rate relative to manifold pressure and venturi-induced pressure drop
- Affects primary air entrainment and resulting flame color, stability, and heat distribution
- Sensitivity to regulator/manifold pressure changes-uniform pressure loss affects all burners but can reveal mismatched orifice sizing
- Replacement must match thread/seat, orifice ID and gas type for safe performance
In practice, technicians verify correct integration by measuring manifold pressure with a manometer and observing flame characteristics at the burner while the oven is operating. A persistent yellow or sooty flame typically indicates a rich mixture (excess gas or insufficient primary air), which can be caused by an oversized orifice, blocked air shutter, or improperly high manifold pressure; a weak, small flame or difficulty maintaining heat can stem from an undersized orifice or low manifold pressure. When converting between natural gas and propane or replacing a damaged part, select an orifice that matches the WB28K10190 specification for the left-front position and confirm the regulator and air shutter settings so the orifice, manifold pressure and venturi achieve the required air-fuel mixing for safe, efficient combustion.
| Item | Description |
|---|---|
| Orifice function | Calibrated restriction that sets gas flow relative to manifold pressure and venturi-induced air entrainment. |
| Compatible gas types | Different orifice sizes are required for natural gas versus propane; match OEM specification for the left-front burner. |
| Typical manifold pressure | Residential natural gas ≈ 3.5″ WC; propane systems commonly use higher pressures (≈10″ WC) and require appropriate orifice sizing and regulator settings. |
| Troubleshooting symptoms | Yellow/sooty flame = rich mixture; weak/small flame = low flow or pressure. check orifice, air shutter, and manifold pressure. |
Common Failure Symptoms and Diagnostic Indicators of a Defective Left Front Orifice
The WB28K10190 GE Oven Left Front Orifice is a precision gas metering component that sets the volumetric flow of gas to the left-front burner by reducing manifold pressure to the burner ports. Its internal diameter, thread form and seating face determine flow rate and compatibility with natural or LP gas; installing the wrong orifice size or a damaged seating surface changes the air-fuel ratio and alters flame characteristics. In practice,the orifice works together with the burner head and manifold pressure regulator,so diagnostic work should separate orifice restriction or enlargement from regulator failure,burner port blockage,or incorrect conversion components when verifying compatibility and performance on GE models and conversions.
Common failure symptoms include a weak or flickering flame, yellow tipping or sooting, delayed ignition or repeated clicking, and uneven heat output on the affected burner.
- Low flame height or weak, gas-smelling ignition
- Yellow/orange flame color and black soot formation
- Igniter cycling or continuous clicking before ignition
- One burner area running hotter or cooler than adjacent burners
Technician checks should include a visual inspection for debris or corrosion in the orifice, measuring manifold pressure against the oven’s service specification, swapping with a known-good orifice to isolate the part, and verifying orifice diameter with appropriate gauges or calipers. A simple reference for diagnostic focus is shown below:
| Item | Description |
|---|---|
| Manifold pressure | Measure pressure at the manifold and compare to the oven’s service spec; low pressure with correct orifice suggests regulator/line issue, while correct pressure with low flame suggests restricted orifice. |
Replacement Considerations and Installation Procedure for the WB28K10190 Left Front Orifice, Including Sealing and Verification Tests
The WB28K10190 GE Oven Left Front Orifice is the metering jet that determines the fuel flow for the left front burner, directly affecting flame size, combustion stability, and local heat output. Orifices are sized for specific gas types and manifold pressures; installing the correct WB28K10190 ensures the jet diameter and thread form match the oven’s manifold and the appliance’s gas type (natural gas or propane).A partially clogged or incorrectly sized orifice produces weak or yellow, sooting flames and uneven cooking in the left front zone, while an undersized jet reduces heat output and an oversized jet can cause excessive flame lift or flame roll-out at the burner head.
Replacement requires controlled mechanical practice and post-installation verification to confirm a gas-tight seal and proper combustion. First, shut off the gas supply and electrical power, remove the burner head and screw out the old orifice, inspect the manifold port for carbon and debris, than install the new WB28K10190 using the sealing method specified in the service manual (gas-rated pipe compound or the manufacturer’s replacement gasket); avoid over-torquing the brass jet. After assembly, perform leak and performance checks: a soap solution or electronic leak detector on fittings, a burner ignition and flame-shape inspection, and a manifold pressure check if service documentation specifies pressure values. If converting gas types or troubleshooting persistent yellow tips, compare the installed orifice diameter against the oven’s conversion chart and verify flame pattern across simultaneous burners to rule out manifold pressure or regulator issues.
- Key verification steps: sealed fitting check, stable blue flame with appropriate lift, absence of soot, and manifold pressure within appliance specifications.
- Installation caution: use only gas-rated sealants/gaskets and follow OEM torque or tightness guidance to prevent leaks or damage to the brass orifice.
| Item | Description |
|---|---|
| Part | WB28K10190 GE Oven Left Front Orifice – OEM metering jet for left front burner |
| Function | Controls volumetric gas flow and flame characteristics at the burner port |
| Compatibility | Match to appliance model and gas type (natural vs LP); verify thread and seating method |
| Common symptom | Clogged or incorrect orifice → weak flame, yellow tips, soot, uneven heating |
Q&A
What is the WB28K10190 left front orifice and what dose it do?
The WB28K10190 is the factory (OEM) gas orifice for the left-front burner on certain GE ranges/ovens. An orifice is a small, threaded fitting that meters the gas flow into the burner head; its hole size and shape determine how much gas reaches the burner at the appliance’s manifold pressure, which in turn affects burner flame size and heat output.
How do I know if the WB28K10190 orifice is compatible with my GE oven?
Check your oven’s model number and the parts list/service sheet for that model; the manufacturer’s parts lookup (GE/GE Appliances) or an authorized parts dealer can confirm compatibility by model number. The orifice part number must match the OEM part listed for the left-front burner on your specific model. If in doubt, remove the tech sheet (often behind the broiler drawer or lower access panel) or contact GE support with the appliance model number.
What are the signs a left-front orifice is clogged or failing?
Common symptoms include a weak or uneven flame at the left-front burner, yellow or sooty flames, burner that won’t light reliably, or very low heat output from that position while other burners work normally. A partially blocked orifice reduces gas flow and changes flame characteristics; however, similar symptoms can also be caused by a dirty burner cap/head, incorrect gas pressure, or ignition issues.
Can I clean a clogged WB28K10190 orifice, or should I replace it?
small clogs sometimes can be cleared by removing the orifice and using compressed air or a soft blast of clean gas to dislodge debris. do not enlarge the hole with wire, needles, or drills – that changes the calibrated flow and is unsafe. If there is corrosion, damage, or repeated clogging, replacement with the correct OEM part is recommended. Always turn off the gas supply and electrical power before removing any gas component, and if you are not qualified, hire a licensed service technician.
Is WB28K10190 for natural gas or propane (LP), and can I use it for conversions?
Orifices are sized differently for natural gas and liquid propane. The WB28K10190 is a specific part number for a particular application; you must use the orifice specified for your fuel type and conversion kit. Converting an appliance between natural gas and LP requires a proper conversion kit (including the correct orifices) and adjustment of manifold pressure and regulators. Conversion should be done by a qualified technician in accordance with local codes and manufacturer instructions.
Where can I buy a replacement WB28K10190 orifice?
You can purchase OEM replacements from GE Appliances’ official parts website, authorized GE parts dealers, or reputable appliance parts retailers online.When ordering, confirm the part number and your oven’s model number to ensure correct fitment. Avoid used or improvised fittings; use genuine or properly specified parts to maintain safe operation.
Is it safe to replace the orifice myself, and what precautions should I take?
replacing an orifice involves working on the gas system and can be hazardous. If you are experienced with gas appliances and local code permits, you must turn off the gas supply and electrical power, follow the appliance service manual instructions, and leak-test all connections after reassembly.If you are unsure, inexperienced, or local code requires it, hire a qualified technician. Never modify an orifice (drilling/enlarging) and always use the correct OEM or specified replacement part for safety and proper performance.
In Summary
The WB28K10190 GE Oven Left Front Orifice is a small but essential component that regulates the gas flow to the oven’s left front burner, directly influencing flame characteristics, heat output and overall cooking performance. Because the orifice determines the precise volume of gas reaching the burner, its correct specification and condition are vital for even heating, efficient fuel use and maintaining safe combustion.
Accurate diagnosis is important when burner or cooking issues arise, since symptoms such as uneven temperatures, weak or erratic flames, or unusual combustion can stem from a variety of causes. Confirming that the orifice is the underlying issue-rather than related components, obstruction, or appliance calibration-helps ensure that any replacement will address the real problem without needless parts changes.
When replacement is required, using the correct WB28K10190 part and following proper installation practices restores intended performance, efficiency and safety. For most users, this means sourcing genuine or compatible parts and, when unsure of diagnosis or fitment, consulting a qualified service technician to verify the issue and perform the work to manufacturer standards.
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