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KEB Frequency Inverter COMBIVERT S4

Have your proven inverter repaired now instead of replacing it

The inverters listed here are no longer available. If you are a business customer and would like to have a defective KEB inverter of the S4 series repaired, you can use our professional KEB repair service .

KEB S4 Frequency Inverter – Current Information & Repair Service


The KEB COMBIVERT S4 series inverters have long been a reliable solution for numerous industrial applications across various industries and were used with power ratings of up to 35 kVA in different systems to control servo motors precisely and reliably. However, the KEB S4 is a discontinued product that is no longer manufactured new by the manufacturer. Nevertheless, many companies continue to rely on the functionality of this inverter. 
To repair service 

S4 Repair Process

Our KEB repair service concept works as follows: 
1. Send enquiry: Contact us via the contact form and provide all relevant details. 
2. Ship the device: Send us your defective device.
3. Analysis: Upon arrival of your delivery, we inspect the condition of your KEB device and send you a transparent cost estimate.
4. Repair: After your approval of the cost estimate, we carry out the repair and return the repaired goods to you within one week. 


The following frequency inverters are still available for purchase: 

KEB Error Messages

Is your KEB COMBIVERT S4 showing a warning or error message? Our compact overview lists error codes of all types as well as specific troubleshooting steps.

Fix errors now

Our KEB Customer Service

Do you need advice or have a specific question? You can reach us via our contact form or by phone at 05262 99104. We are available for you Monday to Friday between 07:00 and 16:00.

To contact form