I have a M2R series LP furnace for a manufactured home. It does not work at all. We installed a new thermostat, reset circuit breaker, vacuumed it, changed filter--Cannot find a reset button Any ideas what might be wrong

There should be a switch (black rocker type) above & left of the burner. There should also be small reset button between two wires near the blower. Inside the electric box on the furnace is a circuit board. There should be an automotive type fuse on the board. It is usually either a 3 or 5 amp fuse.