How to Fix Whirlpool Refrigerator Error Er 4C

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⚠️ Safety Warning: Appliance repair involves electricity, gas, and moving parts. Always disconnect power before working on any appliance.

Error Code: Refrigerator Difficulty: Hard

Problem: Inverter DC bus overvoltage fault

⚖️ Repair Decision

❌ NOT WORTH FIXING

Parts over $250

How to Fix Refrigerator Error

Unplug refrigerator immediately – overvoltage can destroy inverter components.
Measure household voltage at outlet – should be 110-125V AC (voltage >130V causes overvoltage faults).
If household voltage exceeds 125V, contact utility company to correct voltage regulation.
Remove rear access panel to access inverter board.
Inspect DC bus capacitors on inverter for bulging tops or leaking electrolyte.
Check for burnt components near DC bus circuitry on inverter board.
Verify compressor windings aren’t shorted causing regenerative voltage spikes (measure winding resistance).
If household voltage is normal and compressor tests good, inverter board has failed.
Replace inverter assembly W
After replacement, monitor DC bus voltage during operation using oscilloscope if available (should not exceed 380V DC).

OEM Part #: W11338877

Estimated Market Price: $320

If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

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Estimated repair cost (parts, or parts + labor) Most DIY parts are $50–$250. If you have a quote, use the total.

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