Have you checked the burners of your fridge and furnace in your MA.
Cob webs can get into the burner tubes and cause the gas to not flow properly plus rust can cause poor grounding for your gas to ignite,
The ceramic element on end of igniter may have a carbon build up that has to be cleaned with soft cloth and screw connections for tubes and tubes should be cleaned, this link
I gave you will have information for cleaning these items.
On the gas line into the fridge burner there is a valve that needs to be open and you need good house batteries for a good 12v to operate your controls for both items.