In case you have sw16 with Zapi Combi controller alarm description is:
"Mdi hour meter and chopper hour meter ar different (only on MDI)"
This can come up if you replace the controller and you do not disable parameter "load hm from MDI". If you replace the controller and you can't change the parameter, just wait for few minutes and truck will work normally.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.