EB
Frigidaire
Line Voltage Polarity or Ground Fault
Control board flashes EB; furnace may short-cycle 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
Reversed hot/neutral at furnace, Missing equipment ground, Shared neutral issues, Faulty control board sensing circuit
How to Fix / Troubleshooting
Safety: This involves 120V line voltage. If you are not experienced with electrical work, contact a licensed electrician or HVAC technician.
- 1. Visual inspection: Confirm the furnace is plugged into a properly grounded outlet or hard-wired with ground connected to the cabinet.
- 2. Check service switch: Ensure the furnace service switch wiring has hot and neutral correctly landed per the wiring diagram on the furnace door.
- 3. Outlet test: Use a plug-in outlet tester to verify correct polarity and ground at the receptacle (if cord-connected).
- 4. Professional correction: Have an electrician correct any reversed polarity or missing ground. If wiring is correct and EB persists, the control board may be defective and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Integrated Furnace Control Board
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