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The new controller board resolved the FFL error code. I had some confusion with the instructions which stated that for a low nox unit a circuit board tab should be left in place. The instructions stated "for Low NOx Only....DO NOT break tab". I observed that my original board had the tab...

GKruske, My issue is different in that I get a FFL fault right after the temperature is displayed during power on. My system is detecting a flame before it gets to the CFH or SRK stages and is shutting down. I replaced the pilot assembly already and confirmed my grounding. Poolclown above...

The ground wire attaching to the pilot assembly was black for about 1/4" but not melted. I'm thinking this happened on a windy day and some flame spilled back. The heater is near the side of a building but the installation complies with the installation code and passed inspection. I could add...

Thanks for the information. I have a control board on order and will post whether the new controller resolves the FFL fault. What puzzles me is how the controller senses whether there is a flame. The electronic low-nox system has no thermocouple. It just has a spark wire and ground wire...

When I started up my Raypak PR267 low nox heater this week the heater was firing but cutting out frequently. I had this problem a couple of years ago and cleaned the pilot and rewired the frayed ground wire between the pilot and the valve. The unit has run well up to now. Today I proceeded to...