E9
Black+Decker
Door sensing / safety interlock logic fault
Microwave shows E9 and stops; interior light may stay on or off unexpectedly.
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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
Intermittent door switch, Loose door switch bracket, Warped door causing poor contact, Control board door input failure
How to Fix / Troubleshooting
Safety first: Unplug the microwave before inspecting door components.
- Check door alignment:
- Verify the door sits flush with the cabinet and does not sag.
- Inspect hinges for looseness or damage.
- Observe light behavior:
- With the door slowly opened and closed, watch the interior light. Flickering or delayed on/off suggests a door switch issue.
- Tighten switch bracket:
- Remove the outer cabinet.
- Locate the metal or plastic bracket holding the door switches.
- Tighten any loose mounting screws so the switches are firmly positioned.
- Replace intermittent switch: If gently wiggling the switch harness changes the light or display, replace the suspect door switch with a Black+Decker-compatible part.
If E9 remains after door switch and alignment repairs, the control board door input circuit may be faulty and require professional replacement.
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Repair Difficulty
Medium
3/5
Required Part
Door Switch Bracket / Interlock Switch
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