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Loss of pressure across pilot solenoid

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JEMM55
JEMM55 Member Posts: 47
in Gas Heating
I have a Weil McClain model 580 with a midco burner. I am having a problem with the pilot it lights only intermittently when the boiler calls for heat or hot water.

Everything is freshly tuned...ignition, flame rod, all electronics ignition check out and there is excellent spark.m the main gas pressure from the main is over 6in col water. The pressure before the solenoid is also 6 after a 30 inch run past the regulator. The burner calls for 3.5 in column after the solenoid. No matter what I do I cannot figure why the pressure drops to 1.8 max. New solenoid, everything clean but can't get higher pressure so the pilot is lighting intermittently. Any ideas are welcome........help?

Alan

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  • JStar
    JStar Member Posts: 2,752
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    Gas

    What is the main pressure when the pilot solenoid opens? Does it stay at 6+ inWc? Do you have proper voltage going to the solenoid?
  • JEMM55
    JEMM55 Member Posts: 47
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    main pressure unchanged and separate 110 feed for solenoid

    ?
  • JEMM55
    JEMM55 Member Posts: 47
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    main pressure unchanged and separate 110 feed for solenoid

    ?
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