Upgraded a ten year old Harmon P38 with a P38+ circuit board. Now the distribution motor runs full time no matter what feed or temp settings I choose [including OFF], the status light continually blinks 3 times, and the feed motor light stays out, except for brief intervals when the feed motor comes on [about 3 seconds per minute]. The feed rate is just enough to keep the stove running. Any ideas on what may be the problem? Thanks, jmc