Older mobile home with Coleman presidential II gas heater. The pilot is lit. Turn on furnace and thermostat the motor kicks in and runs. The burner never lightes. Blower never blows. What to do?

What to do? Call a repair person as gas furnaces are tricky and you could end up with worse a problem if you try to fix this yourself and don't know what you are doing. Something may need cleaned out such as the burner or the blower motor is gone.