i am so tired of the mr. fix anything and then mess it up. i cannot tell you how many of these calls I am going to with people installing these things they buy off ebay or think they can read a wiring schematic and screw up. I went to one just last week where the guy had removed all the gas piping and rerouted it and rewired his zone valves(had been working for years) and they did not work. i found a short wire sparking to ground cause the valves to not work and a gas leak 4 inches below the short. What is wrong with people.