Error Code: H4 / B4 Difficulty: Easy
Problem: Incorrect wiring.
How to Fix H4 / B4 Error (Step-by-Step)
- Unplug the dryer from the wall outlet to ensure your safety.
- Move the dryer away from the wall to access the back panel.
- Locate the terminal block cover, which is a small plate where the power cord enters the dryer.
- Remove the screw holding the terminal block cover in place and set it aside.
- Visually inspect the three wires connected to the terminal block. Ensure each wire is securely fastened under its respective screw and that there are no loose strands of wire touching other terminals.
- If a wire is loose, use a Phillips head screwdriver or a nut driver to tighten the screw until the wire is secure.
- Replace the terminal block cover and screw, plug the dryer back in, and attempt to start a cycle.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
What to Check Next on This Electrolux Dryer
Focused repair path: dryer airflow, heating, motor, sensor, and control checks. Do not treat the fault as reset-only if it keeps returning; use the failed function to choose the next test.
- Disconnect power before opening panels, then confirm whether the Electrolux dryer repeats the same code after a clean reset.
- Match the symptom to the part of the cycle or function that fails: fill, drain, heat, cool, spin, latch, ignite, fan, sensor, or control response.
- Inspect simple causes first: airflow, water supply, drain path, door closure, filter, venting, wiring connectors, and visible damage.
- Use meter testing or service diagnostics before replacing electronic controls, because wiring, switches, sensors, and loads can mimic board failure.
- Use the complete Electrolux dryer model number from the appliance tag before ordering any model-specific part.
Check, inspect, clean, test, measure, remove, reconnect, clear, and replace parts only when the symptom supports that path. If these checks point toward a part, verify the complete Electrolux model number from the appliance tag before ordering.
Recommended Parts to Check
No exact official OEM part number is listed here because the correct Electrolux dryer part can vary by complete model number. These are targeted part-category searches, not universal fit claims.
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Electrolux dryer thermal fuseCommon replacement category: Thermal fuseFit note: Exact OEM part number varies by complete Electrolux dryer model number. Confirm compatibility before buying.Why this category can matter: no-heat or no-start symptoms after venting and power checks.
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Electrolux dryer heating elementCommon replacement category: Heating elementFit note: Exact OEM part number varies by complete Electrolux dryer model number. Confirm compatibility before buying.Why this category can matter: electric dryer no-heat symptoms after airflow checks.
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Electrolux dryer door switchCommon replacement category: Door switchFit note: Exact OEM part number varies by complete Electrolux dryer model number. Confirm compatibility before buying.Why this category can matter: start or cycle-interrupt symptoms tied to door movement.
Before ordering: match the part to the complete Electrolux dryer model number on the appliance tag.
When It’s Better to Replace Than Repair
Dryer repairs are often worth it for small parts, but repeated heating, motor, drum, or control failures can point toward replacement.
Confirm gas vs electric, venting, voltage, doorway clearance, and laundry-space dimensions before ordering.
For repair parts, verify exact fit with the full dryer model number before buying; these links are general replacement-appliance shopping options.
- [OK]Thermal fuse or heater failures keep returning
- [OK]Belt, roller, or motor repairs exceed unit value
- [OK]Door switch or control issues stack with other faults
- [OK]Older dryer has long dry times even after vent cleaning
Recommended Dryer Replacement Options
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Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.
More options (for a better recommendation)
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Expert: Mike Sullivan
EPA Section 608 Certified Technician with 18+ years experience.
Read Editorial Standards →Browse all Electrolux error codes: Electrolux Error Codes
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