UTBoost question

[shbop]

Installed a UTBoost controller on the a/c fan the other day. At high speed the unit functions as it should, but at any lower speed setting, the fan will increase rpm on it's own, then drop back down. It will continue to do this, until switched back to the high fan-speed position. I've tried, unsuccessfully, to get help from Unwired Tools. Has anyone else been through this? Thanks in advance!