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Burner will not come on but pilot works and stays lite. The fan also works

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If you have a voltmeter, with the thermostat in the heat position and turned several degrees above room temperature, check for 24volts across terminals W and C. If you do not have 24 v there, the problem is in the thermostat or the wires between the furnace and the thermostat.

If you do have 24 volts between W and C, the problem is in the furnace....No idea what brand of furnace you have or whether or not its a high efficiency or not, so here's some generic things to look for.
Look for a "manual reset limit switch" in the furnace vestibule or towards the top inside on the front panel. Also some manufacturers have a manual reset limit switch mounted on the blower. Check for 24v on the gas valve...if its a three terminal valve, the middle terminal is usually a dummy. The two outside terminals should be the 24v to the coil that causes it to open on a call for heat.

Oh yeah, once the pilot was lit manually, make sure the knob was rotated from "pilot" to the "on" position.

You could have open pressure switch caused by a vent blockage if its high efficiency. But if its high efficiency, there should be a set of LED's to blink a failure code. If so, count the blinks and look for the list of failures on the inside of the door of the furnace.

Posted on Dec 11, 2014

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