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pressure readings in combustion chamber of weil mclain gv series 1

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selistar
selistar Member Posts: 2
in THE MAIN WALL
I have problems with my gv -4 . does anyone know what the nominal pressure readings should be in the combustion chamber prior to and after ignition. my pressure sw is set at 1.4 in water. I measure 1.5 in before ignition and 1.0 in after which causes the boiler to shut down.. Unfortunately , i never measured these while my boiler was working. I replaced the vent motor and cleaned out the combustion chamber as best as i could but nothing seems to help

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  • JUGHNE
    JUGHNE Member Posts: 11,062
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    Did you change the hot surface ignitor which is also the flame sensor?
  • selistar
    selistar Member Posts: 2
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    yes
    the flame is proven before the pressure drops
    I temporarily bypassed the press sw and the boiler runs fine although it doesn't seem to heat the water as fast

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