I purchased this unit on the weekend and it has only been running for 2 days but in the 2 days I have noticed that the temperature fluctuates from 38-39 to 49 for a couple seconds then back to 38 to turn the humidifier on as I have my setting for 40. Is something set incorrectly? Also I did not get a manual when I purchased the unit. I would definitely like one so I can try to troubleshoot on my own. I look forward to your early response.