To ansewr the first question, Yes, when the temp drop below the thermostat setting the unit tries to kick on as normal. The fan kick on and in some cases the unit tries to fire with a loud boom noise but doesen't always fire up the burners. It seems after several attempts the unit will fire up.
To answer the second question, I havent really momitored this closely but i have noticed a two degree difference between the setting and room temp before kicking on. This seems to be working as normal with the responce for the call for heat.
In addition i have noticed some ash around and by the floor of the unit. The problem is this is sporadic and we still have heat but the unit is injured and limping to the finish line.