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Ignitor not firing(Carrier furnace)

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  • Ignitor not firing(Carrier furnace)

    I have a carrier 58sx forced air furnace. The ignitor fails to fire. Inducer moter turns on fine, but after 10 second delay, the ICP fails to fire. It is also not recieving 24VAC power. It appears that signal starts at P.C. board(inducer control)travels to pilotcontrol then to pilot sensor back to pilot control, and then to Ignitor control pack. The fusible link to pilot sensor is fine, but no power is reaching ICP.
    I'm guessing that either the pilot, pilotsensor, or ICP is bad? Hopefully not the P.C. board.
    I am going to do a little more trouble shooting and see what I can find.

    Any imput would be great, Thanks


  • #2
    Will the blower turn on in the fan On setting?

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    • #3
      Furnance is Alive Once MOre.

      Not to be outdone, after posting topic I went back to the basment with the multimeter and started troubleshooting the old girl. Like I said before I had power to the Pilot sensor but nothing out of it. Wiring schematic showed that power to ignitor and piolt control valve was out of Pilot sensor and the switch is closed before main burners kick on.I could get the ignitor pack and main blower to turn on by bypassing sensor with a jumper wire.
      So I figured the Sensor is bad. Take it apart and everthing looks good.Mechanical plunger for switch moved fine.
      I noticed the insulation on signal wire out of sensor to the ignitor and piolt was a little frayed. So the stupid wire was shorting out to the equipment ground. Threw some high temp wire wrap over frayed wires put it back together and she works good as new.

      The reason the wireing was frayed appears to be that the Service Tech that last cleaned the furnace out in 2000 before I started working on it myself , over tightened the Zip tye that holds wireing harness on main Gas feed Line in the combustion chamber.It wore threw being in contact without some other form of buffering insulation.

      Well thanks anyways.

      theoriginalscion

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