Electrolux Dryer Error Code H4/B4

The H4/B4 error code indicates a line wiring error detected at the dryer's terminal block, which is where the power cord connects to the appliance. The control board has determined that the incoming power supply wiring is not configured correctly. This code is a protective fault that prevents the dryer from operating until the wiring issue is resolved. The first step is to inspect the connections at the terminal block with the dryer unplugged.

Yes, a line wiring error should be treated as a safety concern. Incorrect wiring at the terminal block can create a shock hazard or fire risk. Always unplug the dryer before inspecting any wiring, and if you are not comfortable working with appliance wiring, contact a qualified appliance repair technician or electrician.

If the fix is simply correcting a loose or swapped wire at the terminal block, the cost may be minimal or involve no parts at all. If a new power cord is needed, replacement cords typically range from around 15 to 50 dollars depending on the cord type. If a technician is needed to diagnose and repair the issue, expect to pay between 75 and 200 dollars for labor and any necessary parts.

Start by unplugging the dryer completely before doing anything else. Remove the terminal block cover and carefully inspect each wire connection to confirm the correct wire is on the correct terminal and that every terminal screw is tight. If a wire is loose, secured to the wrong terminal, or damaged, correct it before restoring power. If the wiring appears correct and the error persists, a power cord replacement or professional electrical inspection may be needed.

Resetting the dryer by unplugging it for a few minutes may temporarily clear the display, but the H4/B4 error will return if the underlying wiring issue has not been corrected. Because this is a fault based on a real condition at the terminal block, the error will continue to appear until the wiring is inspected and any problems are resolved.