Can't get the pilot light to light on my water heater. I turned off the gas line to the water heater. When I turned the gas back on and tried to light the pilot light I get nothing. I have rotated the temp knob to pilot and rotated the control knob to Pilot and depressed it. Then tried to light the pilot but nothing. I have tried twice turning off the water heater (not the gas) and waiting over 10 minutes with the same results. Any help would be great.