I was rewriting all of the configuration file, but when I tried to restart I kept finding Syntax Error '' errors. The reason was that the CHECK HOST was on the last line before some commented out lines, I had commented out IF FAILED because I did not wanted the alert. But the resulting error did not tell me anything. From the documentation it seem like CHECK HOST even should work alone. It does indeed make sense that a method to discover its availability should exist, however the documentation does not tell how, only from the examples are you able to infer how it should be written.
Issue #221 resolved