I have a Weil Mclain ultra 155 series 2. I have to often reset it when it heats domestic hot water as it goes too high. Today it was flashing code E 05. I hit the reset and the entire digital display went dead. I have checked both fuses they are fine. There is power to the unit as the blower fan is working. I note that when I unplug the external transformer the blower fan is much stronger. WHen the external transformer ( 12o v / 24 v AC ) jack is plugged into the control board the fan seems very weak. The capacitors look ok but I am not certain how to test on the board. ANy ideas ?
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