Cant seem to get my Laars lite 2 to work. I changed the pilot, generator pile, on/off switch, thermostat, pressure switch, temp sensor board. I've jumped out high limits, fusible link, fireman switch. It will fire and stay lit as long as TH/TH is jumped out. As soon as I release the TH jump wire it shuts down. Please help with any suggestions. I have 530mv at valve from thermopile. It's a LG325N -THANKS