LG Error Code Alrm — Vault switch

Service Guy AI • Dryer • Medium severity • Intermediate skill • ~30 min repair

What Does LG Error Code Alrm Mean?

LG dryer: Vault switch

This is a medium-severity fault. The machine may complete the current cycle but is signalling a problem you should resolve before it escalates.

Possible Causes (4)

LG engineers identify the following root causes for fault code Alrm. Work through them in the order shown — they are listed from most common to least common.

1. Faulty vault switch
2. Wiring issue in the vault switch circuit
3. Control board malfunction
4. Door interlock failure

Step-by-Step Troubleshooting (6 steps)

Follow this sequence to diagnose and clear LG error code Alrm. Power down and unplug the machine before any internal inspection.

1. Disconnect power before servicing.
2. Inspect the vault switch for visible damage or wear.
3. Check wiring connections to the vault switch for loose or damaged wires.
4. Test the vault switch with a multimeter for continuity.
5. Examine the control board for any burnt components or signs of failure.
6. Ensure the door interlock is functioning properly and securely closed.

Required Parts

Have these LG OEM part numbers ready before starting the repair. AAdvantage Laundry Systems carries verified parts for every code in this database.

• Vault switch
• Control board
• Wiring harness
• Connector

Diagnostic Test Mode

Enter LG diagnostic test mode: Hold 'Rinse+Spin + Power' for 3 seconds

Skill Level & Repair Time

This repair is appropriate for an experienced laundromat owner or in-house technician. You should be comfortable removing service panels, reading wiring diagrams, and using a multimeter to test continuity and voltage. Plan for approximately 30 minutes of active repair time once parts are on hand.

Get AI-Powered Diagnosis

If the steps above don't resolve LG Alrm, run a free Service Guy AI diagnosis. Upload a photo of the error display and get an AI-generated repair plan tied to your exact LG model number, including supplier links for required parts and on-call technician escalation.

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