The 37E error on your Samsung Washer means the main control board has lost communication with a sub component, usually the door lock assembly or the sub PCB. This is often caused by a loose connector or a wiring fault, and it can usually be cleared by power-cycling the machine and checking the connections.

Error code 37E
Meaning Communication failure between the main control board and a sub board or door lock module
Severity Medium — the washer may stop mid-cycle but the fault is often fixable without parts
Time to fix 10–30 minutes
Tools needed Screwdriver (Phillips or Torx, depending on model)

What the 37E error means

The 37E code shows up when the main printed circuit board (PCB) can’t get a proper signal from another board or module inside the washer, most commonly the door lock assembly or the sub PCB. Samsung washers rely on constant communication between these parts to run a cycle safely, so when that link drops, the machine stops and flags the fault rather than continuing.

In many cases this is a temporary glitch caused by a power surge or a loose connector rather than a failed part. It’s worth ruling out the simple causes before assuming you need a replacement board.

Common causes

  • Loose or corroded wiring connector between the main PCB and sub PCB or door lock module
  • A recent power surge or outage that interrupted communication mid-cycle
  • Faulty or worn door lock assembly that isn’t sending a clean signal
  • Damaged wiring harness from repeated door use or vibration over time
  • A failing sub PCB that can no longer relay signals correctly
  • Moisture or condensation inside a connector block

How to fix the 37E error

  1. Power cycle the washer — Unplug the machine for 2–3 minutes, then plug it back in and start a new cycle. This clears many temporary communication faults.
  2. Check the door lock assembly — Open the top or front panel (depending on model) and inspect the door lock unit for visible damage, loose wires, or debris around the connector.
  3. Inspect the wiring harness — Trace the wiring between the main PCB and sub PCB or door lock. Look for pinched, frayed, or disconnected wires and reseat any loose connectors firmly.
  4. Clean and reseat connectors — Unplug the washer, disconnect the relevant connector blocks, check for corrosion or moisture, and reconnect them securely.
  5. Test the door lock switch — If you have a multimeter, check continuity on the door lock switch. Replace it if it fails to show continuity when the door is closed.
  6. Call a technician if the fault returns — If 37E keeps coming back after these checks, the sub PCB or main PCB itself may need replacing, which is best handled by a qualified repair engineer.

FAQ

Can I keep using my washer if it shows 37E?
You can try running another cycle after a power cycle, but if the error returns repeatedly, avoid running loads until the wiring or door lock has been checked, as the machine may stop mid-cycle again.

Is 37E the same as other Samsung error codes like SE or LE?
No. 37E relates to communication faults, while codes such as the Samsung Washer SE Error Code or the Samsung Washer LE Error Code point to different issues like sensor or water level faults. It helps to identify the exact code before troubleshooting.

Do I need a technician to fix 37E?
Not always. Many cases are resolved by power cycling the unit and checking connectors, similar to steps used for the Samsung Washer TE Error Code or Samsung Washer DE Error Code. If the fault persists after basic checks, a technician should inspect the boards.