Thanks for all your info. Yes indeed there are two furnaces. One on each side of the coach. The thermostat does not show furnace in Zone 1 but does so in Zone 2. The model is Atwood 8525. Was not aware of the second furnace until realized there was no heat coming from the vents on the kitchen slide. Just went outside to check the model and found a hornets nest inside. Don't know how long they have been there. The furnace does not come on at all , there is no clicking, no nothing.