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low pressure

Alan_10
Alan_10 Member Posts: 1
I have a Trianco heatmaker boiler with hot water. The pressure gauge reads 7-10 pounds. Shouldn't thewater valve refill to 12-14 automatically? How would I determine if it is the make-up valve or gauge that is not operating properly. Also does anyone know of a good basic operation book for the homeowner that descibes the system operation?
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