Hello my name is veronacarrier 8000 weathermaker will not ignite

I have a carrier 8000 weathermaker with humidafier i can not get it to ignite it was just working 3 days ago now ihave did what is on the cover of the funance door as far as turning down thermastat to lowest setting turning off the power to the furnance ingluding the air conditiner the off the gas switch in side furnance let it stayoff for 5 minutes then turn on gas switch then all power to appliance i did the power off from the breaker then turned on heat put it to 70 still did not ignite my air and my fan still opporate correctly i use to hear when it woud come on i look in furnance to see if i see it ignite but it doesnot i do not even see a flame it is suppose to autimatalicly.please can anyone help freezing in maryland.thank you