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I have a Hydroflame 8500-IV-LD furnace. It will not start automatically. I have two Carrier Air V units on my camper. One unit is a heat pump. I was operating with the heat pump unit and woke up very cold. When the heat pump quit heating because of the outside temperature the furnace did not start. I tried to start the furnace with the other unit and it did not start from the thermostat in the unit. I first thought I had problems with the igniter in the furnace. I had someone operate the units and listened for the sound of the pilot light starting. No sound. Then I depressed the emergency start button on the HP unit for the required 5 seconds and the furnace did start. I then checked the other unit and it did also. My thought was that I had a bad thermostat but it is not usual for two to go at the same time. Then I saw some thing in the service manual about raising the temperature 10 degrees above room and waiting for a minute. My camper is two hundred miles away so I will not get to experiment again until Wednesday. Does anyone have any suggestions about where else to look or what the problem could be?