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If main water supply line is shut off and thermostat is turned up on my gas water heater could relief valve open ?my girlfriend was taking a bath and told me the water pressure was weakening and water wasnt real hot so i turned up the water heater not knowing that the main water supply was turned off. the relief valve opened why did this happen?

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Pressure would go down any time the water is cut off. Temp went down no make up water relief went off cause you turned it up. put it back and put the main back on.

Posted on May 10, 2010

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