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Fan in jhonson and stanley warm air heater not turning off?

Even when I turn off the warm air the fan still blows cold air, i turned off the summer flow too, but nathing still on.
Anyone knows where I can check? what to do?
the system is a Hi-specJ32 System ET. U got it serviced. 2 months ago and was perfect.
Thans for any help
Mary, January 2013