Step 6 · Check Pressure Tank Functionality (Optional but Recommended)

With the power and water shut off (as in Step 1), open a faucet to relieve any pressure. Locate the air valve on the pressure tank (usually covered by a plastic cap). Use an air pressure gauge to check the air pressure in the tank. The air pressure should be 2 PSI below the cut-in pressure of your switch. For example, if your cut-in is 40 PSI, the air charge should be 38 PSI. If the pressure is low, use an air compressor to add air. If the tank feels heavy with water and there's no air pressure, the bladder may have failed and the tank may need replacement.