Hi, I have a Goodman Furnace GMP075-04 about 9 years old.. it doesn't come on when I switch my thermostat to heat... I replace the ignitor last year and it worked fine until now... blower doesn't come on either... I tried turning the air conditioner on and it works fine... I have went through the routine of turning off the gas, unplugged power, wait 5 min, turn on gas, plug in power and nothing... any suggestions...