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An igniter heats up to light the gas burner. When an igniter wears out or cracks, the unit may try to start its heating cycle but fail to ignite the gas.
Specifications
- Part number: 18186
- Brand: Ultrafryer
- Part type: Ignitor rod
- Height: 0.95 in / 2.41 cm
- Length: 3.5 in / 8.89 cm
- Width: 1.65 in / 4.19 cm
- Volts: must be the same, often 120 V
- Material: silicon carbide or nitride, as listed
- Shape and mount: must fit the same bracket
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
How the Igniter Works
The igniter serves as the heat source that lights the incoming gas. During a call for heat, electric current flows through the element until it reaches a temperature hot enough to ignite the fuel safely.
If the igniter is cracked or broken, the circuit remains open or fails to reach the necessary temperature. The control system may attempt to cycle, but the burners will never light without that initial heat source.
Understanding the Part Specs
Physical size is critical when checking an igniter. It must sit correctly in the burner assembly so the element meets the gas stream without hitting surrounding metal parts.
The specifications for part number 18186 include the following measurements:
- Height: 0.95 in / 2.41 cm
- Length: 3.5 in / 8.89 cm
- Width: 1.65 in / 4.19 cm
How to Confirm a Replacement Matches
Before replacing this part, inspect your old hardware closely. Match criteria for igniters include voltage, element material, and mounting shape.
Check these three points against your existing setup:
- Volts: The operating voltage must be the same, often 120 V.
- Material: Check whether the part uses silicon carbide or silicon nitride, as listed for the unit.
- Shape and mount: The base and physical element must fit the exact same bracket.
Signs of Failure and Safe Replacement Steps
A damaged igniter often shows visible cracks, breaks, or dark spots on the heating element. You may also see the unit call for heat while the igniter fails to glow at all.
Follow these steps to replace an igniter safely:
- Turn off the electrical breaker to the unit and shut off the gas supply line.
- Access the burner compartment and take a clear photo of the wiring connections.
- Disconnect the wire leads carefully without tugging on the harness.
- Unscrew the mounting bracket to remove the old igniter.
- Set the replacement igniter into place, handling it only by the ceramic base or bracket.
- Secure the mounting screw and attach the wires to the same spots as shown in your photo.
Read your old part
- Turn off power to the equipment before inspecting the burner area.
- Locate the existing igniter mounted near the gas burner assembly.
- Wipe away dust from the ceramic base or bracket to read any stamped numbers.
- Check that the stamped part number reads 18186.
- Measure the old part to ensure its dimensions match 0.95 in / 2.41 cm high, 3.5 in / 8.89 cm long, and 1.65 in / 4.19 cm wide.
When to call a pro
Working on gas systems carries serious safety risks. Gas valve work means opening gas lines and setting gas pressure, which a licensed tech should do. Hire a licensed HVAC technician for any step you are not sure you can do safely.
Questions
Why should I avoid touching the igniter element?
Igniters are brittle and sensitive. Natural oils from your skin can stick to the element surface, creating hot spots that shorten its operating life.
Can I replace an 80 V igniter with a 120 V igniter?
No, they are not interchangeable. Most furnace hot surface igniters run on 120 V, but some use 80 V, and the voltage rating must match the equipment requirements.
What is the difference between silicon carbide and silicon nitride igniters?
Silicon nitride igniters last longer than silicon carbide igniters. Both materials are brittle, so either type must be handled with care during service.
What should I do if I smell gas while checking the part?
If you smell gas, do not touch any light switch or electrical control. Leave the house immediately and call your gas company from outside.
Related part numbers
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- 18A333Relay, UltrafryerSame brand
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