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3208 Controller issue

a 3208 controller has been installed on my which is not controlling well. It had a sp of 200 and a pv of 280. When I began to raise the sp I noticed that the heating output came on even though I was well below the pv. I would have expected no change till the sp had exceeded the pv. What I would like to know is why this would happen and how do I correct it.
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