Just bought a house with the carrier weathermaker 58sxb060-gg furnace and have no operating manual and cannot locate one. Power is on to furnace, gas is on, but unsure how to start furnace operation. Thermostat turned up does not turn furnace on. No pilot on and leds do light up - green initially, then yellow flashes on and both go off. No noise coming from unit. Any suggestions? Unsure how to operate this unit.