Replace the circut board, some problems were on the ducane units. Look at the back of the board, see any brown spots like it has gotten hot? How about a model # and serial # this really helps. Also note this is not a d.i.y. for the homeowner to replace a board,also could be the smart valve. they have settings and need to be installed by a pro contractor. If he cant figure it out then it is time to look for one whom knows what they are doing. Also does it work properly when you turn the power off and restart the unit?
[Edited by 9mmnow on 02-02-2005 at 02:50 PM]