I agree,have it checked or replaced..You can ask here too for advice or
confirmation..
http://www.hvacmechanic.com/forums/forums.htm


HVACTECH2 wrote:
On 14 Jan 2007 06:18:17 -0800, "Sam" wrote:

Hello,

My gas furnace turns on if I reset the power to it and brings the
temperature up to set point. However, it seems that the next time the
thermostat sends the signal, the furnace doesn't start until I cycle
its power switch.


There is no way to troubleshoot a furnace remotely But it sounds as
though it is locking out on a flame safety. You should have it checked
before it locks out permanently.