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I've highlighted the C wire for you in the schematic. And in the actual wiring


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I did all the above checks on my gas furnace and none solved the issue. Then I blew compressed air through each of the gas venturis (the hourglass shaped tubes that mix the natural gas with the air - flames come out the back). It turns out that over the years that the furnace was in service, the dust build-up in the venturis was enough to affect the gas ...


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You can connect the C wire to any of the blue wires highlighted below, as they are all connected.


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All gas furnaces require a flue to exhaust carbon monoxide outdoors, the reason modern units require a fan to do it is due to the circuitous design of modern heat exchangers that extract more heat from the unit before exhausting it outdoors, natural venting will no longer happen if the induced draft motor is not running, So much heat is removed these days ...


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Jump red to green and see if the indoor blower runs, if so you have 24 volt power and the transformer and 3 amp fuse on your circuit board are fine,if not check the 3 amp automotive type fuse found on your circuit board. If you have no fuse the transfomer may be bad from touching red to Common a direct short which fries the transformer. Is there a diagnostic ...


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Your burners are cycling on and off it is the induced draft that is running on until killing poer if I understand you correctly. If the flue or blower limit were tripped they will not automatically reset themselves or by killing power to the unit then restoring it, nor will flame roll out safeties they must be manually reset and have a little red button to ...


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The fact you have to turn it off or down to reset the unit tells us the unit is having a fault and locking out which requires a reset or a tine soan to pass before it will run again. Typically this is due to the induced draft proving switch, it is a pressure switch that proves the induced draft motor is operating and it is ok to transition to ignition and ...


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TR is Common on your unit, Every 24 volt device will have a Common leg as well as the 24 volt hot leg, just as a car battery has pos and neg, common is akin to neg in this case. Common is called this cause every 24 volt circuit terminates upon Common to complete the circuit. The last pic shown is the "time on" "temperature off" fan delay, the 2 lighter ...


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The thermostat you posted has no Common terminal the blue wire that should be wired to Common at the thermostat is cut of and wrapped around the harness. You show Red, White Yellow and Green wired to R,W,Y,G terminal on the thermostat, but there is no Common terminal on that thermostat and the blue wire that should be wired to Common is unused at the ...



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