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  1. R

    Raypak Low-Nox 337a stuck in SPARK

    I finagled a "best offer" deal off ebay for a used board and it has resolved the problem. It fired right up, so the failure to rectify the pilot flame was on the control board. The newer boards are a nice improvement over the originals. I noticed a very strong spark and I also noticed that 94F...
  2. R

    Raypak Low-Nox 337a stuck in SPARK

    I used a car spark plug wire to replace the original wire with same result. I also tested the valve by manually switching the main valve on. So I guess that leaves me with replacing the board.,
  3. R

    Raypak Low-Nox 337a stuck in SPARK

    I have the older version control board 337A with electronic ignition. The pilot is lit instantly but the unit stays in Spark, so the pilot is not rectified. I replaced the pilot assembly and it seems well grounded and lights up instantly. Could it be the "tension" spark wire even though it...