Direct answer
On the covered Electrolux dryer, H4, B4 means electrolux states H4 / B4 means incorrect wiring, and names it a known installation issue. First, do not attempt to rewire the dryer yourself.
Definition versus diagnosis
The display names a detected condition—not an automatically failed part.
What this covers
- Electrolux dryer covered by the cited source
- Displayed code or documented alias: H4, B4
- The exact operating state described by the manufacturer
What it does not cover
- ×Another product type or original-manufacturer platform
- ×A visually similar but different code
- ×Internal live electrical, sealed-system, gas, battery-cell or control-board repair
Match every character and the exact product
ReversiblePhotograph the complete display and product label. This record covers H4, B4 on Electrolux dryers. Electrolux names two of these as installation or supply faults rather than dryer failures, and one (EF1) as a ventilation blockage. Availability varies by model.
Preserve the failure state
ReversibleDo not attempt to rewire the dryer yourself. Record the operating stage, recent change and what still works before clearing the message.
Correct only the documented fault domain
ReversibleElectrolux directs contacting your installer — this is an installation fault, not a dryer failure. Do not borrow a reset or meaning from a similar code, product or model year.
Verify once, then respect the service boundary
ReversibleRepeat only the shortest safe action that reaches the original stage. If H4, B4 returns, stop repeated resets and use model-specific manufacturer support.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What does H4, B4 mean on a Electrolux dryer?+
Electrolux states H4 / B4 means incorrect wiring, and names it a known installation issue.
Can I reset H4, B4 without fixing the cause?+
A reset may hide the display temporarily but does not correct the documented fault. Record the code and complete only the safe checks first.
Why is the complete model number required?+
Manufacturers reuse characters across platforms. The model number determines which official table, controls and service boundary apply.
When should I stop?+
Stop for smoke, arcing, burning odor, uncontrolled water, gas odor, battery swelling, extreme heat or any condition the manufacturer directs to professional service.
Answer for the exact device and software version shown above.