Webasto ThermoTop: Diagnostic Software & Error Codes

Translated on 24-10-2026, 8:16.

Hello,

Can someone please help me?
I need software to read and, if necessary, clear the error codes from my ThermoTop.

Thank you very much.
Tommy.

Translated on 24-10-2026, 8:17.

Hello!

Google recommends this to you:

http://www.techwebasto.com/thermosystems_thermo_test.htm

Best regards.
Maxx.

Translated on 24-10-2026, 8:17.

Thank you.
But I was told that you can't read or clear error codes with it!

Translated on 24-10-2026, 8:17.

And I'm telling you that you can do things with it.

Do you have an auxiliary heater that was installed later, or did it come with the car from the factory?

Translated on 24-10-2026, 8:18.

Even though this might be a repost, but: Is it possible to change the temperature setting that is always targeted in the interior when using the SH (standing heating) function of a (factory-installed) SH system, using this Webasto software or another software?

"Thank you."

Translated on 24-10-2026, 8:19.

Hi,

It's an aftermarket Webasto unit.
Okay, then I'll try to see if this works

.
Thank you for the information...

Translated on 24-10-2026, 8:19.

To the best of my knowledge, the old software had issues with optocouplers. If you drive a VAG vehicle, I would suggest first trying to access a different control unit using VAG-COM for testing purposes.

Translated on 24-10-2026, 8:20.

christians wrote:

As far as I am aware, the old software had problems with optocouplers.

"That's also my experience. ThermoTest doesn't work with Opto-Adapters. However, there was a DOS version (with a smaller set of features) that did work with Opto-Adapters!"

Translated on 24-10-2026, 8:20.

Okay, I'm ready. Please provide the German text you want me to translate.