Simpson Washing Machine Error E40

⚡ Quick Answer: The E40 error code on your Simpson Washing Machine indicates a malfunction in the door lock mechanism. This prevents the door from locking securely, w... ✅ DIY Fixable

What Does Error E40 Mean?

The E40 error code on your Simpson Washing Machine indicates a malfunction in the door lock mechanism. This prevents the door from locking securely, which in turn stops the machine from starting. Symptoms include the machine not starting or proceeding with the wash cycle, and the error may display immediately after powering on, even if the door appears closed.

Common Symptoms:

  • Machine won’t start or proceed with cycle
  • E40 displayed immediately after power on or when attempting to start wash
  • Door/lid appears closed but error persists

Possible Causes

  • Door/Lid not fully closed (medium)
  • Faulty door lock mechanism or sensor (medium)

How to Fix Error E40

DIY Fix Check and secure closure of the door/lid

  1. Ensure the washer is powered off.
  2. Open and then firmly close the door/lid, listening for a secure click.
  3. Check for laundry caught in the door seal that may prevent full closure.
  4. Attempt to restart the wash cycle.

DIY Fix Inspect for overload or obstructions

  1. Remove some laundry if the machine is overloaded.
  2. Check that clothing is not obstructing the door from closing fully.
  3. Try running a test cycle with a light load.

Technician Only Inspect and possibly replace the door lock assembly or sensor

  1. Disconnect power to the machine.
  2. Remove the washing machine access panel to reach the door lock assembly.
  3. Inspect wiring and connections for damage or corrosion.
  4. Test lock mechanism and sensor for continuity or correct functionality.
  5. Replace failed door lock/sensor parts.
  6. Reassemble and retest operation.

Parts needed: Door lock assembly, Door lock sensor, Associated wiring/connectors

🛑 When to Call a Pro:
  • If the error persists after ensuring correct door closure and checking for obstructions
  • If the door lock assembly or sensor testing indicates electrical faults
  • If there are signs of wiring damage or intermittent lock engagement

Next step

Choose the next step for E40

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Based on diagnostic data

Most relevant component to inspect

Door Lock Assembly

Secures the door shut during operation for safety and signals the control board to run.

Typical part-only price
$30 - $75
DIY difficulty
Easy
Estimated time
10-20 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.

Technical Specifications

wattage N/A
component Door Lock Mechanism
resistance 1-5 ohms
part_number Simpson 123456789
voltage_rating 240V AC

Common Questions

What does E40 error mean on Simpson Washing Machine?

E40 error indicates a door lock malfunction, preventing the machine from starting.

Can I fix Simpson Washing Machine E40 error myself?

Yes, check the door closure and remove any obstructions to attempt a fix.

How much does it cost to fix E40 error?

Repair costs vary by model and region, typically moderate for parts and labor.

When should I call a technician for E40?

Call a technician if the error persists after checking the door or if electrical faults are suspected.

Sources & References

Data last verified: 2026-04-23

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