The Gas furnace in my 1996 mobile home won't start. It keeps blinking once, then twice. The Model is:MMHB-077ABHR-06
SERIAL:MMH960101982

Any advice would be greatly appreaciated.

Its giving you a code 21 or 12. You should have a chart on the door of the furnace or around the control board to tell what the code is.

No code on door. Only wiring diagram