E18
Wolf
Igniter Circuit Fault
Furnace shows E18; inducer and blower may run but no ignition occurs.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open hot surface igniter, Loose igniter connector, Broken igniter wiring, Failed igniter relay on Wolf control board
How to Fix / Troubleshooting
Safety: Turn off power and gas. The igniter is fragile; handle carefully and avoid touching the element with bare fingers.
- Visual inspection: Locate the hot surface igniter near the burners. Look for cracks or breaks in the element.
- Continuity test: Disconnect the igniter plug and measure resistance across the igniter terminals. An open circuit indicates a failed igniter that must be replaced with the correct Wolf igniter part.
- Connector check: Ensure the igniter plug is fully seated on both the igniter and the control board.
- Control output: A technician can verify that the control board is sending power to the igniter during the ignition sequence. If not, the Wolf control board may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Wolf Hot Surface Igniter
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