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boiler blow off

cccx3cccx3 Posts: 1Member
boiler keeps blowing off at 30 lbs new fill valve set at 10 lbs new relief valve 30 lbs new expansion tank new aquastat. Furnace shuts off at 180 temp but lbs goes to 30 have a pressure gauge before expansion tank shows pressure water in at 10 lbs but goes up to 30 expansion tank has 15 20 lbs pressure in it

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