Difference between detected height of both PrintCores exceeds realistic values

[huat90 0]

Hi, my UM 3 has been printing fine but today this message suddenly pop up "Difference between detected height of both PrintCores exceeds realistic values". I had calibrated the lift switch but still get this message. please help guru.

 

 

[CarloK2 4]

The official Ultimaker page on bed levelling errors: https://support.makerbot.com/s/article/1667410781005

 

For more background and info, read this great post by @gr5: 

 

[asmamecheter 0]

Try calibrating the build plate! also check if the nozzle tips has any debris. You can try cleaning print cores also!

 

[huat90 0]

Nozzle cleaned. Build plate levelled. Still get this message Difference between detected height of both PrintCores exceeds realistic values? need advise what to do?

[gr5 2,238]

I have a lot of respect for CarloK2.  I'm dissapointed you didn't read it and reply with more information.  Cleaning the nozzle and levelling the bed are the least likely causes of the error. You should read his post again.  Which has you go to my post.  Which has you do a few tests.  Basically you have to watch it do the leveling and you can learn a lot.  There are MANY possible failures.  Most of them are easy to fix.  

[Dustin 160]

The article linked by @gr5 also points out about 80-90% of all possible causes of this issue.
Despite how silly each step sounds, they are all relevant to resolving the issue.