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Blower comes on ,no flame most of the time,but when flame comes on it only lasts for a few minutes then stops. light flashes 4 times,i have replaced primary limeter to no avail.?

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Your sensor is dirty. The sensor is the little rod that sticks in to the flame. It is just a little bigger around than a pencil lead and has one wire connected to it. It will be mounted just a few inches from the ignitor glow coil.
Turn power off to furnace
Take the sensor off
DO NOT wash it.
Take emory cloth or very light sand paper and lightly brush the steel rod of the sensor
You can also use a fine wire brush.
Put it back together and fire the furnace up again, chances are you've fixed your problem

Posted on May 28, 2011

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