I have a WP 2040 (as best as I can tell as I don't have the info plate) that has no forward or reverse with no flashing LED. I have checked all the wires, The Handle Switches or what I've seen called Brake interlock switches and the wires that go down to the EMB but I have no Idea what the tiller switch is to diagnose that as the schematic shows that it is what releases the brake. I'm not sure if this is the problem but I don't know where else to look other than a bad controller.