E18
Sub-Zero
Relay Stuck or Output Drive Fault
Oven display shows E18 and the unit may not maintain temperature or may cycle erratically.
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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
Stuck bake or broil relay on control board, Shorted triac or power device, Internal control board failure, Overheated relay contacts
How to Fix / Troubleshooting
Safety: Turn off power at the breaker. Do not operate the oven if it is overheating or cycling unpredictably.
- Observe behavior: Note whether the oven overheats, underheats, or fails to turn elements off. This helps identify which relay may be stuck.
- Inspect control board: Remove the control panel or rear cover to access the main control board. Look for burned spots, cracked solder joints, or melted relay housings.
- Check wiring: Ensure element wires are not shorted together or to chassis.
- Replace control board: Because relay and triac components are not typically serviceable individually, replace the entire main control board if physical damage or E18 persists.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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