my presto pressure canner won't come up to pressure, the regulator just kinda rocks but the gauge stays at zero, what's up?

Diagnosis

When the regulator (the weighted gauge) is rocking but the pressure gauge remains at zero, you are experiencing a "false positive" of pressure. The rocking occurs because steam is escaping through a leak, creating enough localized airflow to move the weight, but not enough internal atmospheric pressure to actually compress the air inside the vessel. In the Presto 01755, this is almost always caused by a failure in the primary seal or a blockage in the vent pipe that is allowing steam to bypass the regulator. To confirm this, perform a "soap test." While the canner is heating, carefully spray a mixture of dish soap and water around the rim of the lid where it meets the pot. If you see a curtain of bubbles forming rapidly, the gasket is failing. If the bubbles are coming from the area around the locking lugs, the lid is not fully engaged. If the regulator is rocking but you see steam escaping from the sides of the lid rather than just the vent pipe, the vessel is unable to reach the 10-11 PSI required for canning.

How to Fix It

1. Immediately turn off the heat source and wait for the unit to cool completely. Never attempt to open a pressure canner while the regulator is still rocking or the gauge shows any pressure.
2. Remove the lid and extract the rubber sealing gasket from the lid's groove. Inspect the gasket for "flat spots," cracks, or food debris. If the gasket feels brittle or has a visible tear, replace it with a genuine Presto replacement part.
3. Clean the rim of the aluminum pot and the groove of the lid using a damp cloth and mild soap. Even a single grain of salt or a piece of food stuck in the rim can create a microscopic gap that prevents a full seal.
4. Reinsert the gasket, ensuring it is pressed firmly into the groove all the way around. Ensure there are no twists or overlaps in the rubber.
5. Check the vent pipe. Use a pipe cleaner or a thin wire to ensure the hole leading from the pot to the regulator is completely clear of debris. If this pipe is partially clogged, steam will build up in the lid area and leak out the sides rather than pushing the regulator up.
6. Place the lid back on the canner and rotate the handle fully to the locked position. Ensure the locking lugs are fully engaged and the lid does not wiggle when pushed.
7. Fill the canner with the required amount of water (usually 2-3 inches), lock the lid, and turn the heat to high. Wait for the regulator to rock steadily for 10 minutes before reducing heat to maintain the rock.

If That Didn't Work

• Inspect the Gauge Connection: If the regulator is rocking strongly and the lid is clearly sealed (no steam escaping the sides), but the gauge still reads zero, the gauge itself is likely defective or the internal capillary tube is blocked. Try swapping the gauge with a known working one to see if the needle moves.
• Check for Lid Warpage: Place the lid on a completely flat surface (like a granite countertop). Press down on the edges; if the lid rocks or wobbles, the aluminum has warped from overheating. A warped lid cannot create a vacuum-tight seal regardless of the gasket condition.
• Verify Heat Output: If you are using an electric coil stove, ensure the pot is centered perfectly over the burner. If the heat is uneven, the water may not be boiling vigorously enough to create the necessary steam volume to lift the weight and register on the gauge simultaneously.
• Replace the Regulator Weight: Ensure you are using the correct weight for the 01755 model. If the weight is damaged or has a hole drilled in the bottom, it will not create the necessary backpressure to register on the gauge.

Heads Up

• Never use a screwdriver or pliers to force the lid shut; this will bend the locking lugs and permanently ruin the seal.
• Store the canner with the lid upside down or slightly ajar. Storing it locked with the gasket compressed for months at a time causes the rubber to develop permanent flat spots.
• Always replace the sealing gasket every 1-2 years, even if it looks okay, as the rubber degrades over time due to high-heat exposure.
• Avoid using metal scrubbers on the rim of the pot, as scratches in the aluminum can create leak paths that the gasket cannot fill.