Use /.timer instead of /timer, the dot in front of a command is used to silent the command:
If you want to force a command to perform quietly ie. without printing out any information, then you can prefix it with a "." full stop. For example:
/ignore somenick
Would print out information telling you that you are now ignoring "somenick". If you do not want this information to be displayed, then you can use:
/.ignore somenick
