--- title: "Dryer error code H4 / B4" description: "Electrolux dryer error code H4 / B4: The machine is reporting that the supply it is connected to is not wired the way it expects." url: "https://electroluxmiami.support/error-codes/dryer-h4-b4/" date_modified: "2026-09-11" Appliance type: "Dryers" --- # Dryer error code H4 / B4 ### What H4 / B4 means on this make The machine is reporting that the supply it is connected to is not wired the way it expects. An electric dryer in the United States runs on two legs of 240 volts plus a neutral, and the motor and controls take 120 from one leg — so a cord landed on the wrong terminals, or a three-prong cord fitted to a four-prong machine without moving the bonding strap, gives a dryer that lights up, tumbles, and never heats. The maker sends this straight back to the installer, and that is the right address: it is the outlet and the cord, not the appliance. ### The other ways this one is printed H4 / B4 · H4 · B4 The same condition is printed differently on different panels of the same make, and every spelling the maker publishes for it is above. Whichever of them you searched for, this is the right page. ### Where this appears, and why not to clear it On the appliance’s own display, as a short single code — a letter and a number, or two letters. Nothing alternates and nothing arrives in halves on this make, so what the panel shows is the whole of it. Photograph it before you cut the power. This maker’s own answer to most of these is thirty seconds at the breaker, and that is worth following once — but a display that has been cleared has taken the evidence with it, and there is no way to ask the machine for it again. ### What to do about it - Stop using the machine and do not keep resetting it. Wiring failures do not improve with attempts. - Check whether the cord is three-prong or four-prong and whether it matches the outlet — a swap done at delivery is where this usually starts. - If the dryer was installed in the last thirty days, the maker’s own instruction is to go back to the installer, and it costs you nothing. - Otherwise have the outlet and the cord checked by somebody qualified before anybody opens the appliance. This is one of the few codes where the problem sits outside the machine. ### Where this goes next The job this usually becomes is [diagnostic visit](/services/diagnostic-visit/), and that page carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes, reminders and settings rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 912-9018](tel:+13059129018) and describe what the panel is doing before booking anything. Incorrect wiring. This is a known installation issue, please contact your installer. What this one means What H4 / B4 means on this make The machine is reporting that the supply it is connected to is not wired the way it expects. An electric dryer in the United States runs on two legs of 240 volts plus a neutral, and the motor and controls take 120 from one leg — so a cord landed on the wrong terminals, or a three-prong cord fitted to a four-prong machine without moving the bonding strap, gives a dryer that lights up, tumbles, and never heats. The maker sends this straight back to the installer, and that is the right address: it is the outlet and the cord, not the appliance. The other ways this one is printed H4 / B4 · H4 · B4 The same condition is printed differently on different panels of the same make, and every spelling the maker publishes for it is above. Whichever of them you searched for, this is the right page. Where this appears, and why not to clear it On the appliance’s own display, as a short single code — a letter and a number, or two letters. Nothing alternates and nothing arrives in halves on this make, so what the panel shows is the whole of it. Photograph it before you cut the power. This maker’s own answer to most of these is thirty seconds at the breaker, and that is worth following once — but a display that has been cleared has taken the evidence with it, and there is no way to ask the machine for it again. What to do about it Stop using the machine and do not keep resetting it. Wiring failures do not improve with attempts. Check whether the cord is three-prong or four-prong and whether it matches the outlet — a swap done at delivery is where this usually starts. If the dryer was installed in the last thirty days, the maker’s own instruction is to go back to the installer, and it costs you nothing. Otherwise have the outlet and the cord checked by somebody qualified before anybody opens the appliance. This is one of the few codes where the problem sits outside the machine. Where this goes next The job this usually becomes is diagnostic visit, and that page carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes, reminders and settings rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 912-9018](tel:+13059129018) and describe what the panel is doing before booking anything. --- **[Read full article: Dryer error code H4 / B4](https://electroluxmiami.support/error-codes/dryer-h4-b4/)**