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Heater furnace doesn't want to turn on'

\015 I have a intertherm heater (ultraflex) model 431900 about 24yro. just last wednesday, march 11,09. i turned the heat on in the morning and it didn't want to turn on (firstime it happened). i thought the thermostat was the problem,so i bought a new thermostat and replaced the old one. after i installed the new thermostat, the furnace didn't turned on also. all the wirings were connected properly. can somebody help me what could possibly the problem or what went wrong? thanks,\015

Answers :

Did the fan turn on, if it did when was the last time you cleaned the filter.

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