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Sounds like the circuit board needs to be replaced. The exact same thing happened on my house furnace. Power went to the board, producing the flashing led, but stopped there. I believe this is what you mean?
Your heater is listed under a safety/inspection recall notice, these units have been found to overheat in certain circumstances, which can lead to a failure of the heat exchanger and the furnace. Might be the cause of your problems: http://www.dgatprogram.com/ They should do a free inspection, Good luck
Trying to find out what 4 flashes on the internet will be exhausting. However if you have the manual it is explained under trouble shooting. If not, look for a wiring diagram and an error code chart will be on the diagram. Sorry I could not be more help.
There are a few reasons why your furnace is restarting after it reaches temp. and shuts off. First, if you have a mercury bulb thermostat it needs to be level and the heat anticipator needs set properly. If you have an electronic thermostat then you need to make sure the DIP switch settings inside are set properly for propane. If you have a digital thermostat there are also settings to be made for your type of heating. These settings will be explained in the thermostat installation instructions. Also, Make sure your furnace filter is clean. If this does not help then there are some other things to check which may need to be done by a technician depending on your mechanical aptitude. Hope this helps!
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