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weil mclain boiler gv-4 short cycling
I have a 1992 or 1993 weil mclain boiler gv-4 I m having problems with it short cycling fires runs for 15-30 secs shuts off and keeps repeating. I have changed the ignitor, vacuum switch, twice cleaned and checked vaccum lines, took apart PVC fresh air cleaned, took apart the PVC flue and had lots off rust in the flue where it attaches to boiler I blow it out cleaned. The boiler will run and get to temp only if I jump the Vacuum switch. I checked vacuum with a dual-port manometer I'm at 1.5 that's good. I cant figure this out please help!