Heil furnace model PGF024K060A comes on fine runs to set temp kicks off heat, blower stays on but heat won't come back on until you shut down system

On initial start up on my Heil 7000 furnace it is making one heck of a noise until the blower comes on at which time everything is normal. Heater is working perfectly at that point. Do you have any ideas?

So far here's what I've got - 1. Thermostat calls for heat. 2. The inducer fan blows air. 3. 24v is sent to the pressure switch. 4. The pressure switch does not close (there is no voltage on the other side). Steps I've taken - 1. Jumping the pressure switch allows the furnace to...

I have a 10 year old Heil furnace. When the furnace tries to come on the combustion fan comes on but nothing happens after that. The pilot does not come on, no flames, nothing. I hired a service tech and he said that we need to change the gas valve since it faulty. Is there anything else I...