I had installed a yr ago heater , thought it was ok , now iam getting error messages  E2 & E16 . I turned off and re started went ok then message E16 . Anyone getting problems like this?  I would  like to know.

Check the air inlet to heater is clear, change your gas bottle.

Those are the suggested actions for your error codes.

Chris.

See page 13:

https://www.truma.net/sites/default/files/inline-files/truma-heating-cp-plus-varioheat-operating-installation-us-en.pdf