My heating unit stopped working a couple of weeks ago and then miraculously started working again on its own, coincidentally enough the same afternoon that we had an earthquake. Early Monday morning we had another and I arrived at my shop to find it cold–no heat. Yesterday the service guy came and told me the circuit board is fried. This morning we had another earthquake. When I got to the shop it was warm and the heater was running! I think God is playing with me.