I have a Comfortmaker RPJ II gas furnace with an electronic igniter (no standing pilot light). The furnace and the fan come on when signaled by the thermostat but the furnace does not light. No flames come out ofthe burners. I've tested this with two different thermostats thinking our old thermostat was not turning on the furnace. But you can hear it come on. Any ideas what else would keep the burners from lighting/ not igniting? or what the problem may be? There is no smell of gas. Any help would be appreciated. Thanks.