Electrolux Dryer H4 / B4 — What It Means & How to Fix It
H4 / B4 means the dryer is seeing incorrect wiring, flagged by Electrolux as an installation issue — a moment to call your installer, not a parts supplier.
What this code means
H4 / B4 means the dryer detected incorrect wiring; Electrolux treats it as a known installation issue and directs you to your installer.
Applies to Electrolux front-load dryers (EFME/EFMG series); the official guide lists H4/B4 as incorrect wiring and H2/B2 as a power-supply issue — the display will show which pair you have.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Improper wiring from a recent installation | Common | No — installer or electrician |
| Loose connection at the terminal block | Occasional | No — electrician |
What you can try yourself
- Confirm when the dryer was installed — if it's under 30 days, contact your installer directly.
- If the dryer is older, unplug it for a minute and restart once to rule out a one-off glitch.
- Have a licensed electrician verify the wiring and connections before any dryer parts are replaced.
When to call a technician
- Do not attempt mains wiring yourself — the installer or a licensed electrician should handle it.
- If the code returns after a reset, don't keep cycling — get the hookup inspected.
Typical professional repair cost: $0 under the install warranty; an electrician visit is typically $100–$250
Frequently asked questions
Who should fix H4/B4?
Your installer if the dryer is new, or a licensed electrician — Electrolux itself says incorrect wiring is an installation issue.
Can I ignore H4/B4?
No — the dryer won't trust its electrical connections, and incorrect wiring is a safety concern. Have it looked at.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Electrolux codes
- Electrolux Dryer EF1 EF1 is the dryer's airflow alarm — the exhaust path can't breathe, so the dryer slows down and warns you about the blockage.
- Electrolux Dryer E42 Dryer E42 means 'door open' to the machine — it won't heat or tumble until the door registers as closed.
- Electrolux Dryer E4 E4 means the moisture sensor that tells the dryer when clothes are dry has failed — auto-dry cycles can't measure, but manual cycles still work.
- Electrolux Dryer H2 / B2 H2 / B2 is the dryer's power-supply alarm — the control board sees abnormal incoming power and wants the power supply looked at.
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