Ask Me Help Desk - Coleman presidential 2 blower runs at slow speed only

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Coleman presidential 2 blower runs at slow speed only

I have a Coleman Pres. 2 electric furnace(20KW) mdl#3120-751.The blower will only run @ slow speed and will not run @ high after warm up. The heat strips are clean and seem to work as the unit produces heat but @ very low CFM.
Not sure what and how to test.Any help appreciated!

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