E4
Gaggenau
Supply Voltage Too Low / Undervoltage
Induction cooktop shows E4 and the affected zone does not heat
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Low line voltage under load, Undersized circuit or long cable run causing voltage drop, Loose connection at terminal block, Faulty power module voltage detection
How to Fix / Troubleshooting
Safety: Turn off the circuit breaker before accessing any wiring or terminal blocks.
- Test other appliances: If lights dim or other appliances slow when the cooktop is used, there may be a supply or circuit issue.
- Avoid overloading circuit: Ensure the cooktop is on a dedicated circuit sized according to the Gaggenau installation manual (typically 30–40 A depending on model).
- Check terminal block (electrician/technician): With power off, remove the cooktop from the counter as per manual and inspect the terminal block for loose screws, discoloration, or heat damage. Tighten connections to spec.
- Measure voltage under load: An electrician should measure voltage at the cooktop while zones are on. If voltage is below spec, correct the supply or wiring.
- If supply is correct but E4 remains: The power module may misread voltage and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Terminal Block Assembly
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