I have a Amana Furnace/water heater combination product that was installed in 1988. The problem is with the electronic control board. For three years I have had to replace the board because the automatic blower connection will not function. I can leave the blower on all the time but the only way I have been able to fix the problem is to change the board. The furnace heats well and takes care of the water. I first thought that a power surge might have cause a short, but I have put a Surge Protector at the the electric plug in, but it did not help.