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Dev, You need to check your 24 volt control circuit? Start with the thermostat, take the R and W wires off of the thermostat and twist them together, See if the burner lights, Flick the R and W wires
Some units of this model have a factory defect that Toshiba will fix even though out of warranty. Take a look at this website and see if you can find a solution with Toshiba on it. I don't know if the
Dev, If you have an older forced air furnace that has a standing pilot? It sounds like it needs a new thermocouple, The thermocouple is the element that the pilot flame is burning onto at the pilot
Robert, If you are sure you replaced the correct limit, then either a secondary limit has been weakened by the lack of filter change or the A/C coil under the furnace is clogged Of the blower wheel
My first guess would be the convergence circuit has failed - a very common cause of failure - even though this is not the most common symptom. However, a bad convergence circuit can manifest itself in

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