Have a problem with a Tempstar 90+ 9MPV furnace. It won't come on sometimes and I have to trip the breaker off and on to get it going. May work for days then act up again but is happening more often.
It is flashing a soft lockout max of 4 trials for ignition reached 3 hr delay.

Already changed the thermostat. 

 
Is this something simple I can fix or do I need a service call?  


Thanks
pointrow