E07
Sub-Zero
Low Line Voltage or Power Supply Error
Oven display shows E07 and the unit may shut down during use or not start.
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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
Household supply voltage below specification, Loose power connections at junction box, Damaged power cord or wiring harness, Faulty power supply section of main control board
How to Fix / Troubleshooting
Safety: This fault involves high voltage. If you are not comfortable working with electrical systems, contact a licensed electrician or Sub-Zero technician.
- Check other appliances: Verify if lights dim or other appliances behave abnormally when the oven is used. This may indicate a house wiring or breaker issue.
- Inspect junction box: Turn off the breaker. Remove the junction box cover where the oven is wired. Check for loose wire nuts, burned insulation, or discoloration. Tighten connections and replace any damaged wiring.
- Verify breaker size: Ensure the oven is on the correct amperage breaker as specified in the installation manual (commonly 30–40A for wall ovens).
- Measure voltage (for qualified persons): With appropriate tools and training, measure line voltage at the junction box. It should typically be around 240 VAC (or 208 VAC in some installations). Low or fluctuating voltage requires an electrician.
- Control board: If supply voltage is correct but E07 persists, the power supply circuitry on the main control board may be failing and should be replaced.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (Power Supply Section)
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