I can not get my furnace to run. The digital thermostat is blank but there is 24vac present. I tried jumping the red (Rh) wire to the green, yellow, white wires individually but nothing happens. I went to the furnace itself and and the LED was solid red. I jumped the "Test" post with the "24C" post and got the - one quick blink and one steady blink on the LED, indicating no fault codes. The furnace cycled through the test like it was suppose to, but I still get a blank thermostat and the furnace won't engage when jumping wires.