I have a Raypak heating problem. I turn the heater on and the unit goes into CFH, I hear the ignition, hear the flame for 30 seconds or so then a super quick PRS, SPK, and the process starts all over. The interval is not consistent, often times the operation does not last 30 seconds.
i did however pull the leads to the pressure switch and tie them together for troubleshooting purposes and this had no effect. So at this point I really don't know what to do.