What does 9E1 mean?
Power supply voltage is below acceptable range.
Common causes
- Low household voltage
- Extension cord use
- Loose outlet connection
- Shared circuit overloaded
Diagnostic & testing steps
- 1. Check outlet voltage - should be 120VAC (+/- 10%)
- 2. Do not use extension cords
- 3. Ensure dedicated circuit
- 4. Check for loose connections at outlet
Safety warning
⚠️ Have electrician inspect if voltage consistently low
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