pictures would help us help you...from what it sounds like ..either bad stat..or open saftey switch...ben srI only have two wires connected to thermostat, (red, white) i have a green NOT doing anything, I have a switch to cout power off at furnace, red, white IS connected at furnace, furnace ignites and works fine as long as turn toggle off, cross-red. white wires, flip toggle-works great, turn toggle off connect red, white to RTHL111(with new alk. batt.), flip toggle, nothing on therm. screen, I have a new circuit card in it, the red led does NOT come on when therm. is on it?, can you help?