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Old 01-14-2005, 01:06 PM   #1
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1995 Coachman Santara F 53 chassis:
I turn on the heat and the propane heater comes on and blows hot air, so I go inside the house. When I come back 30 min. or an hour later the fan is on, but it is blowing cold air. I turn it off and try it 30 min. or an hour later and it does the same thing.
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Old 01-14-2005, 01:06 PM   #2
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1995 Coachman Santara F 53 chassis:
I turn on the heat and the propane heater comes on and blows hot air, so I go inside the house. When I come back 30 min. or an hour later the fan is on, but it is blowing cold air. I turn it off and try it 30 min. or an hour later and it does the same thing.
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Old 01-15-2005, 05:29 AM   #3
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The furnace is going into what is called a "lock out" condition. It is a saftey built into the ignition board that if the flame sensor does not see the flame it will shut down the gas valve. The older style(prior to 2002) furnaces let the fan continue to run with no heat; the new ones have changed the design so the fan will shut down too. There are a couple of reasons yours is doing what it is. 1 the board is bad; 2 the furnace is cycleing on high limit and the board tries to ignite while the high limit t'stat is open and goes into lock out. 3 the burner may be partially blocked or a flake of rust is covering some burner holes. 4 you have an obstruction in the outside air/combustion circuit. If it is cycling on high limit make sure no vents are blocked or ducts kinked. The return air is important too; keep it clear of blockage. If someone in your area can check the DSI (direct spark ignition) board to verify that it is good or not may help you diagnose the porblem. Good luck and keep us posted.
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Old 01-15-2005, 05:49 PM   #4
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Thanx!
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