simon, please post the contents of /etc/default/weewx
you are probably experiencing the behavior reported in this issue: https://github.com/weewx/weewx/issues/917#issuecomment-1895917342 m -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/0ddc2511-ffba-4458-a219-fe49bfe4c56en%40googlegroups.com.
