I own a Stromer ST-1 since Oct. 2014 with 3300 miles. Yesterday while doing a 7 miles climb of average 8% grade, at mile 5 I got an error message..."HEAT" In 3300 miles I have never gotten any error message. I was in Eco mode averaging about 7 mph. The air temp was 63 degrees. I know this is a long steep climb but I have done this many times before in warmer temps with no error messages. I have a call into Stromer Tech Support but thought someone in the forum may have encountered a similar problem. Thanks in advance for your responses.