With t-stat in heat mode and temp turned up the furnace blower comes on//I no draft motor should come on first then hot surface Ignitor,then burners and then fan blower//tested transformer//circuit boards has 120 feeding out to transformer//and 24 volt to circuit board.but when testing power out from circuit board to ignitor and draft motor at plug in it shows nothing.I have lost my memory I had been a hvac repairman.. and cant remember the test sequence to save my live... still have my service tools and trying to help my son fix his furnace please help and I do have 24 volt between r/w at circuit board making a call for heat last time I repaired a problem like this it was a bad ignitor.. any help... please
