C-90
Samsung
Power Supply / Low Voltage Error
Oven displays C-90 and may not heat or may shut off during operation.
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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
Incorrect line voltage, Loose power terminal connections, Damaged power cord or junction box wiring, Faulty main PCB power supply section
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker. Only qualified persons should work inside the junction box or on high-voltage wiring.
- Verify supply voltage:
- Have a qualified electrician measure the voltage at the oven junction box; it should match the rating on the oven nameplate (typically 240V AC in North America).
- Inspect connections:
- Check that the power cord or hardwire connections are tight and free of burns.
- Look for signs of overheating at the terminal block on the oven.
- Correct wiring issues:
- Repair or replace any burnt terminals, wires, or lugs.
- If supply is good: The internal power supply on the main PCB may be failing; replace the main PCB.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Relay Control Board
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