LG Dishwasher Won’t Start, Stops Mid-Cycle, or Showing Error Codes? The Main Control Board Is the Most Common Cause.

The main control board is the brain of the dishwasher — it manages every cycle function including water fill, wash, drain, heat, and drying. When it fails, the dishwasher won’t start, stops mid-cycle without completing, displays error codes that won’t clear, or behaves erratically. The AGM76429511 is the OEM replacement main control board for compatible LG LDF, LDP, and LDT series dishwashers, directly replacing AGM76429503, EBR79609803, EBR79609804, and EBR79609805.

Symptoms of a Failed Dishwasher Main Control Board

• Dishwasher won’t start at all — no response when pressing Start
• Dishwasher stops mid-cycle and won’t resume
• Error codes displayed that won’t clear after a power reset
• Cycle completes but dishes come out dirty — wash or heat functions not activating
• Dishwasher fills with water but won’t wash or drain
• Buttons on the control panel unresponsive or behaving erratically
• Dishwasher starts randomly or selects wrong cycle
• No water fill despite the cycle appearing to start
• Drain pump runs continuously or won’t run at all
• Dishwasher powers on but display is blank or shows garbled content

Part Details

• Primary OEM Part Number: AGM76429511
• Also Sold As: AGM76429503 (alternate SKU — select from Buying Options)
• Replaces: AGM76429503, EBR79609803, EBR79609804, EBR79609805
• Type: Dishwasher Main Control Board (PCB / Electronic Control Board)
• Compatible Brands: LG
• Compatible Series: LDF, LDP, LDT series LG dishwashers
• Condition Options: New (OEM) · Used (Certified Pre-Owned, tested)
• Function: Controls all dishwasher cycle functions — fill, wash, drain, heat, dry, and user interface communication

Installation Notes

• Skill Level: Intermediate — requires door panel removal and PCB harness disconnection
• Disconnect power at the breaker or unplug the dishwasher before starting
• The main control board is typically located behind the inner door panel — remove the door screws and carefully separate the inner and outer door panels
• Photograph all harness connector positions before disconnecting — connectors are keyed but photographing prevents reassembly errors
• Handle the PCB carefully — avoid static discharge and do not touch board traces or components
• Transfer any mounting standoffs or brackets from the old board to the new one if required
• Verify all connectors click fully into place — a partially seated connector causes intermittent faults
• Restore power and run a full diagnostic cycle to confirm all functions are operating correctly
• If error codes persist after replacement, check the door latch, thermal fuse, and wiring harness before assuming the new board is defective

Compatible Models

LDB4548ST, LDF5545BB, LDF5545BD, LDF5545SS, LDF5545ST, LDF5545WW, LDFN4542W, LDFN454HT, LDP5676BD, LDP6797BB, LDP6797BD, LDP6797BM, LDP6797SS, LDP6797ST, LDP6797WW, LDP6809BD, LDPN6761T, LDT5665BB, LDT5665BD, LDT5665ST, LDT5665WW

Contact us with your full LG model number to confirm fitment before ordering.

New vs. Used — Which Option Is Right for You?

The New variant is a fresh OEM-spec control board — ideal for full service life and peace of mind. The Used variant is a Certified Pre-Owned board pulled from a working unit and tested before sale — a practical choice for an older dishwasher or when cost is a priority. Both options ship from XPart Supply Ltd. in Canada.

✓ Model-Specific Repair Pages