Samsung Washer 42 Error Code: Causes and Fixes

The E-42 error on your Samsung Microwave means there is a communication problem between the control board and the keypad or touchpad assembly. This error typically occurs when the microwave detects a malfunction in the user interface connection or a fault in the control circuitry.

What the E-42 error means

The E-42 error code indicates a communication failure between your Samsung microwave’s main control board and the keypad or touchpad interface. When you press buttons on the control panel, signals should be transmitted to the control board to execute commands. If this communication pathway is interrupted due to loose connections, moisture damage, or component failure, the E-42 error appears. The microwave will typically become non-responsive and refuse to operate until the issue is resolved.

Common causes

• Loose or disconnected ribbon cable between the keypad and control board
• Moisture or grease buildup on the keypad membrane or control panel connections
• Faulty touchpad or keypad assembly with damaged circuitry
• Damaged or corroded wire harness connections
• Failed main control board unable to receive keypad signals
• Power surge or electrical spike that disrupted communication protocols

How to fix the E-42 error

1. Power cycle the microwave completely — Unplug the microwave from the wall outlet and wait 3-5 minutes to allow the control board to fully reset. Plug it back in and test if the error clears. This resolves temporary electronic glitches in about 20% of cases.
2. Inspect and clean the control panel — Remove the outer casing or control panel cover using a screwdriver. Check for any visible moisture, grease, or food particles around the keypad area. Clean gently with isopropyl alcohol on a cotton swab and allow to dry completely before reassembling.
3. Check the ribbon cable connections — Locate the flat ribbon cable connecting the keypad to the control board. Disconnect and reconnect it firmly to ensure a secure connection. Look for any signs of damage, burning, or corrosion on the cable or connector pins. Replace the cable if damaged.
4. Test the keypad assembly — If connections are secure but the error persists, the keypad/touchpad assembly itself may be faulty. Order a replacement keypad assembly specific to your Samsung microwave model number and install it according to the manufacturer’s instructions.
5. Replace the main control board — If a new keypad doesn’t resolve the issue, the main control board is likely defective. This is the most expensive repair, typically costing $150-$250 for the part. Ensure you purchase the correct board for your exact model number.
6. Contact Samsung service — If your microwave is still under warranty or if you’re uncomfortable working with electronic components, schedule a service appointment with an authorized Samsung technician who can diagnose and repair the issue safely.

FAQ

Can I still use my Samsung microwave with the E-42 error?
No, when the E-42 error appears, the microwave will not function because the control board cannot receive commands from the keypad. The appliance is disabled as a safety measure until the communication issue is resolved.

How much does it cost to fix a Samsung microwave E-42 error?
Repair costs vary depending on the cause. A simple cleaning or cable reseating costs nothing if done yourself. A replacement keypad assembly typically costs $50-$100, while a new control board ranges from $150-$250. Professional repair service including labor runs $150-$300 total.

Is the E-42 error covered under Samsung warranty?
If your Samsung microwave is still within the manufacturer’s warranty period (typically 1 year for parts and labor), the E-42 error repair should be covered at no cost. Check your purchase date and warranty documentation, then contact Samsung customer service at 1-800-726-7864 to schedule warranty service.