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Old 03-07-2017, 01:13 PM   #1
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Suburban SF42 Furnace & Thermostat Problems

I just replaced my SF42 furnace in my 2000 Journey 34D. The furnace checks out good and will start up and run when I short the 2 blue wires in the furnace together. These 2 blue wires are part of the 4 wire connector which comes from the furnace. The connector coming from the coach only has 3 wires; 2 yellow wires and one white wire. When I turn the thermostat to Heat and turn thermostat to max heat, nothing happens. I have a good 12 volts coming from the coach in thee 3 wire connector which comes from the coach. Still confused why 4 wires go into this connector.
Anyway, when I wire the Red to Red, Yellow to Yellow and blue to blue, the blower starts after about 10 seconds, then about 5 seconds later the burner comes on and begins to heat. I have NO control of the furnace after then from the thermostat. When I remove the Blue wires, the gas goes off and after the cool down period, the blower stops.
Is my thermostat bad? The thermostat controls both Heat and Air in my coach,
Anyone have any suggestions?
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Old 03-07-2017, 04:04 PM   #2
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You gave the make and model # of the furnace, what about the thermostat? You could use Google to search for a manual for the thermostat and what the wiring should be.
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