I have a Rheem pool heater. The ignition does not work. It is an IID, intermittent ignition device. I have replaced the igniter. However, I fear it is the control board. What voltage should I see on the power lead to the igniter coming from the control board? My transformer is providing 24 V to the control board. And the control board does show CFH (call for heat) and SPK (spark). However, I don't see any voltage going to the igniter?