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  1. #1
    Join Date
    Jul 2009

    Default Electric Ignition Won't Start

    Greetings All,

    I have a Lennox electric ignition furnace. When I turn up the thermostat I hear the furnace start (it even starts gas flow) but nothing lights.

    It has a box where all the wires are attached to.

    Here are the markings:

    Robert Shaw Controls Company
    Model No SP735L-- Lennox P/N 18G9101

    Is there a blown fuse inside this box?

    Does this problem have anything to do with the box?

    Thanks for the help.

  2. #2
    Join Date
    Feb 2009

    Default Re: Electric Ignition Won't Start

    Don’t know but can tell you this:

    In my last house the igniter burned out four times and in my present home it has burned out once.

    My present furnace has a flashing light diagnostic code that helped figure it out but, I figured that’s what the problem was.

    Now I keep a spare on hand and it’s a few minute change out.
    Last edited by NEC; 10-24-2009 at 08:10 PM.

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