WB28K10190 GE Oven Left Front Orifice is a fixed gas metering orifice used in GE gas ranges and range/oven combinations to regulate the fuel flow to the left front burner. It is a small, precision-machined fitting-typically brass or plated steel-with a defined bore diameter that threads into the oven/range manifold or orifice holder; its geometry determines the volumetric flow rate of the gas at a given manifold pressure and thereby the burner’s maximum output in BTU/h.
Inside the appliance the orifice functions as the primary flow-limiting element between the gas valve/manifold and the burner head; it directly interacts with the regulator and gas valve to establish correct mixture and flame characteristics, and it interfaces mechanically with the burner tube and retention clip or holder. Because the orifice size governs fuel mass flow, it affects flame shape, combustion efficiency, ignition reliability and heat distribution.It is therefore a key component for safe, stable operation and for correct appliance performance whether the appliance is set up for natural gas or LP/propane service (where different orifice sizes are required).
In this article readers will find a technical overview of the WB28K10190 orifice covering its intended function and physical specifications, guidance on model compatibility and gas-type considerations, common failure symptoms (for example weak or irregular flame, yellow tipping, sooting, or inability to reach expected heat), troubleshooting steps to isolate orifice versus upstream pressure or valve faults, and practical replacement considerations such as verifying bore size, maintaining proper seal and torque, and safe gas shutoff and leak-check procedures. The content is aimed at technicians, engineers and informed appliance owners who need factual, service-oriented facts to diagnose, verify and replace this component correctly.
Table of Contents
- Function and Role of the Left Front Orifice in Burner Gas Delivery
- How the WB28K10190 GE Oven Left Front orifice Operates Within the Burner Assembly
- Common Failure Symptoms and Diagnostic Indicators for the Left Front Orifice
- Compatibility, replacement Considerations and Step‑by‑step Installation for the Left Front Orifice
- Q&A
- In Summary
Function and Role of the Left Front orifice in Burner Gas Delivery
WB28K10190 GE Oven left Front Orifice is a precision-machined gas orifice installed at the left-front burner port that meters volumetric gas flow to that specific burner.The orifice diameter and port geometry determine the mass flow for a given manifold pressure, so the component works with the burner head and regulator to establish flame size, heat output and combustion characteristics.Compatibility is persistent by orifice size and thread/seat form; replacing the left-front orifice with the wrong size or one intended for a different fuel (natural gas vs LP) changes BTU delivery and can produce weak, yellow or sooty flames or uneven cooking across the cooktop or oven cavity.
- Meters gas flow to set BTU output for the left-front burner
- Works in series with the manifold regulator and burner head geometry
- clogs, corrosion, or incorrect sizing change flame appearance and heat distribution
- Different orifice sizes are required for natural gas versus LP conversions; match part number or manufacturer specification
In service diagnostics, technicians inspect the orifice for blockage, verify the stamped size or part number, and confirm manifold pressure before replacing the component; changing only the orifice without checking upstream pressure or burner condition can leave performance problems unresolved. Practical examples include a clogged orifice that causes a delayed ignition and reduced flame height on the left-front burner, or a swapped LP orifice that produces an over-rich, sooty flame on natural gas systems. Use the correct replacement orifice and follow pressure/flow checks to restore designed combustion and heating performance.
| item | Description |
|---|---|
| Part number | WB28K10190 – left-front orifice for select GE ovens; specify gas type when ordering |
| Function | Meters gas flow at the left-front burner to achieve the designed BTU output |
| Common symptoms of failure | Weak or uneven flame, yellow or sooty combustion, delayed ignition, reduced heat output |
How the WB28K10190 GE oven Left Front Orifice Operates Within the Burner Assembly
The WB28K10190 GE Oven Left Front Orifice is the precision metering jet that determines the volume of gas delivered to the left-front burner ports. Mounted between the manifold and the burner head, the orifice has a fixed aperture that, together with manifold/regulator pressure, establishes the local fuel flow and primary air/fuel ratio entering the burner slots. In normal operation the orifice produces a consistent, evenly distributed ring of small blue flames; its physical form and aperture size are selected to match the oven’s design manifold pressure and the intended fuel type, so the orifice directly affects heat output, combustion efficiency, and stable ignition behavior.
In service, the orifice’s behavior is diagnostic: partial blockage, erosion, or an incorrect orifice size for the gas type produces weak, yellow, or uneven flames and can cause soot or delayed ignition. Compatibility is critical - WB28K10190 is specified for particular GE oven models and gas configurations,and substituting a different orifice size (such as using an LP orifice in a natural-gas system) will change flame characteristics and can create unsafe conditions.Technicians should verify the part number and gas type before replacement, inspect the orifice seat and burner ports for contamination, and confirm correct flame pattern and pressure after installation; common observable symptoms and checks are listed below.
- Weak or scattered flames - possible partial clog or undersized aperture
- Yellow or sooty flame – incorrect air/fuel mixture or contaminated orifice
- Delayed ignition or hiss – worn or mis-sized orifice or pressure mismatch
- Correct flame: stable blue cone with sharp inner cone and even ring
| Item | Description |
|---|---|
| Function | Fixed aperture jet that meters gas flow to the left-front burner |
| Location | Screws into the burner/manifold assembly at the left-front position |
| Material | Machined metal (typically brass or stainless) to resist heat and corrosion |
| Compatibility | Matched to OEM models and gas type; replace only with correct part number and gas-specific orifice |
Common Failure Symptoms and Diagnostic Indicators for the Left Front Orifice
The WB28K10190 GE Oven Left Front Orifice is the calibrated gas jet that meters fuel to the left‑front burner; its aperture size and condition directly determine flame height, stability, and combustion quality at that port. In correct operation the orifice produces a steady blue cone and predictable heat output for cooktop and oven ignition sequences; compatibility requires matching the OEM part number and the appliance’s gas type (natural or LP). Mechanical damage,corrosion,or obstruction alters flow characteristics and will change combustion behavior without affecting electronic ignition components,so technicians should treat the orifice as a primary mechanical control when diagnosing low or erratic flame on that position.
- Low or uneven flame height at the left‑front burner
- Yellow or sooty flame color localized to the left front
- Delayed ignition or flame that extinguishes at low settings
- Strong gas odor near the left front before ignition
- Visible debris, corrosion, or distorted aperture when the orifice is removed
Diagnostic indicators are both visual and functional: inspect the removed orifice under magnification for partial blockages or burrs, observe flame shape during steady‑state operation, and compare left‑front behavior to adjacent burners to isolate the issue to the orifice rather than supply pressure or manifold valves. A practical workflow is visual inspection, then controlled swap with a known good orifice or measured flow test if available; persistent yellowing or soot after cleaning suggests incorrect orifice size or air/fuel imbalance upstream.When replacing, confirm the WB28K10190 GE Oven Left Front Orifice matches the appliance model and gas type, and document any differences in flame pattern before and after replacement to verify restoration of normal combustion.
| Item | Description |
|---|---|
| Clogged aperture | reduced flame height and uneven heating; clean or replace the orifice and check for debris in the burner tube. |
Compatibility, Replacement Considerations and Step‑by‑Step Installation for the Left Front Orifice
The WB28K10190 GE Oven Left Front Orifice is a calibrated gas nozzle that meters fuel to the left front burner; its drilled diameter and seating geometry determine the flame size, combustion stability, and heat output. Functionally, the orifice converts manifold pressure to a controlled jet that mixes with primary air at the burner tube; small changes in orifice diameter, thread seating, or alignment will change air‑fuel ratio and flame appearance.OEM compatibility depends on the oven model and whether the appliance is set up for natural gas or LP/propane – the same part number should be confirmed against the oven’s model and serial orifice chart because conversion kits use different drill sizes. In service situations, symptoms such as a weak yellow flame, flame lift, or uneven heating often indicate a clogged, damaged, or incorrect orifice rather than a fault in the valve or ignitor; measuring the existing jet and checking the stamped part number provides practical confirmation before replacement.
Replacement and installation require matching the orifice drill size, thread engagement and seating washer where applicable; choose a direct OEM WB28K10190 part or an aftermarket unit verified to the same specifications. Follow these practical steps for removal and installation, observing standard gas safety precautions and basic torque control:
- Isolate utilities: shut off the oven’s gas supply and disconnect electrical power.
- Remove the burner cap and lift the burner tube to expose the orifice; inspect the seating area for debris or damage.
- Use the correct-size wrench or socket to back out the old orifice, noting orientation and any sealing washer; avoid rounding the hex flats.
- Compare the new orifice to the old one (drill opening, thread size, length), then hand-start the replacement and tighten to snug; avoid over‑torquing-typically light wrench torque is sufficient to seat the part without distorting the assembly.
- reassemble the burner, restore gas and power, and observe ignition and flame quality; check for leaks with a soap solution at the joint and verify stable blue flame without lift or yellow tips.
| Item | Description |
|---|---|
| Tooling | 7/16″ or 11 mm wrench/sockets commonly fit orifice hex; use non‑rounded tools to prevent damage |
| Gas type | Verify natural vs LP before replacing-the WB28K10190 designation corresponds to the specified configuration |
| Tightening | Snug seating torque; avoid high torque values that deform the orifice or burner tube |
Q&A
What is the WB28K10190 GE Oven Left Front Orifice?
The WB28K10190 is the factory replacement orifice (jet) used for the left‑front gas burner on certain GE gas ranges/oven cooktops. An orifice is a small, precisely sized brass fitting that meters the flow of gas into a burner. It determines the correct gas volume for proper flame size and combustion at that specific burner location.
How do I know if WB28K10190 is the correct orifice for my range?
Confirm compatibility by checking your appliance model number (usually on a tag behind the oven door, on the frame, or on the back of the unit) and looking up the parts diagram on GE Parts or an authorized parts dealer. The same part number might potentially be listed for the left‑front burner. Never assume interchangeability – many ranges use different orifices for each burner and for natural gas vs. LP conversions.
What are the common symptoms of a faulty orifice?
Symptoms include a weak or uneven flame, yellow or sooty flame (indicating incomplete combustion), popping or noisy burners, burner that won’t light or stays low, and flame lifting. These can be caused by blockage, debris, corrosion, or damage to the orifice. Always inspect the burner cap and ports too, since they can mimic orifice problems.
Can I clean the WB28K10190 or should I replace it?
Minor clogs can sometimes be cleared with compressed air or a soft wire (from the orifice side toward the manifold), but take care not to enlarge or damage the metering hole. If the orifice is corroded, deformed, or the flame problems persist after cleaning, replace it. For gas safety and precise metering,replacing a questionable orifice with the correct OEM part is usually best.
How do I safely replace the left‑front orifice (WB28K10190)?
Turn off the gas supply and electrical power to the appliance. Remove the burner cap and burner head to access the orifice. Use the appropriately sized wrench or socket to remove the existing orifice from the manifold tube – avoid damaging the manifold. Install the new orifice hand‑tight and then snug with a wrench (do not over‑torque; a small additional fraction turn is usually sufficient).Reassemble the burner, restore gas and power, and perform a leak check and flame test. If you are not comfortable working on gas appliances, hire a qualified technician.
How should I check for gas leaks and verify the orifice installation?
After installation and before lighting multiple burners, turn the gas back on and apply a soap/water solution or a commercial gas leak detector to the connection. Bubbles indicate a leak – turn the gas off immediately and correct the connection. when safe, light the burner and observe the flame: it should be steady and mostly blue with minimal yellow tips.If flames are yellow, unstable, or the smell of gas is present, shut off the appliance and seek professional service.
Can I substitute a different orifice size or use a universal orifice?
No – do not substitute or modify orifice sizes unless performing an approved conversion (for example, natural gas to LP) following the manufacturer’s conversion kit and instructions. Orifice size is critical to correct fuel/air ratio and safety. Use the OEM WB28K10190 or the manufacturer‑specified equivalent for your specific model and fuel type.
Where can I buy the WB28K10190 and is it a user‑replaceable part?
The part is available from GE Parts, authorized parts distributors, and many appliance parts retailers. It is physically user‑replaceable by someone comfortable working with gas appliances, but because gas work can be hazardous and may effect warranty or safety, many owners prefer a licensed appliance technician to install and test the part. Always verify the part number against your model before purchase.
In Summary
The WB28K10190 GE Oven Left Front Orifice is a small but critical component that regulates the flow of gas to the oven’s left front burner. By ensuring the correct gas metering and flame characteristics, the orifice directly influences cooking performance, energy efficiency, and safe combustion. Proper sizing and condition of the orifice help maintain consistent temperatures and prevent issues such as weak flames, sooting, or uneven heat distribution.
Routine inspection and accurate diagnosis are critically important when operational symptoms appear. Problems commonly linked to a faulty orifice include clogged passages from debris or residue, wear that alters the orifice opening, or incorrect replacement parts that change gas flow. Identifying the root cause-through visual inspection, burner testing, and verification of part compatibility-reduces downtime and prevents unneeded repairs.
When replacement is required, using the correct WB28K10190 GE Oven Left front Orifice and following manufacturer specifications is essential. Proper installation, leak testing, and post-repair performance checks ensure the oven returns to safe, reliable operation. If there is any uncertainty about diagnosis or safe installation, engaging a qualified appliance technician and adhering to local codes and manufacturer guidance is the recommended course of action.
Professional Appliance Service
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