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Ihave a Day & Night Furnace M/N:58GS050-3 Series 301 S/N:Z33A65482. My problem is with no wiring whatsoever landed @ terminal strip fan runs @ high speed constantly.With stat wired up & a call for heat I get no spark,just fan(fan switch -auto). 24vac is present into circuit board from transformer, but drops out to 15.xx @ R & C.If I apply 24v directly to R along w/other wiring,fan stops,but after ignition main burners light,fan never runs.

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SOURCE: power up unit and thermostat,

You have a short circuit, which is obviously dangerous. Your blower motor is controlled via a 24VAC control circuit, but is 120VAC. The circuit board and gas valve are probably history, but it needs to be troubleshot to determine the scope of the damage.If you remove T stat you will see several colored wires. The red and green wire when touched together should cause your fan blower to run. If that works when you bypass t stat the t stat is gone. The red to white will open your gas valve on your heater. The red to the yellow or blue will start your AC compressor or condenser fan motor. Be careful with the yellow and blue wires as one is actually a neutral and one goes to the AC contractor on your condenser unit contractor. Hope this helps!

Posted on Aug 02, 2011

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