Instant Pot Lid Not Sealing — Not Reaching Pressure Fix

What Does This Error Mean?

An Instant Pot that will not reach pressure almost always has a sealing ring that is missing, incorrectly seated, or damaged. The second most common cause is the steam release valve left in the Venting position. Check both of these before anything else.

Affected Models

Instant Pot Duo
Instant Pot Duo Plus
Instant Pot Ultra
Instant Pot Pro
Instant Pot Lux

Common Causes

Sealing ring missing, incorrectly seated, or cracked
Steam release valve in Venting position instead of Sealing
Lid not aligned and locked — the arrow on the lid must align with the lock symbol
Not enough liquid in the pot — minimum 1 cup required for pressure to build
Float valve stuck in the up position from a previous cook
Overfilled pot — contents above the MAX line block the float valve

How to Fix It

Check the sealing ring first.

Open the lid and look at the underside rim. The silicone sealing ring should be seated evenly all the way around in the groove — no lifted sections, no gaps. Remove it and reseat it, pressing it firmly into the groove all the way around. If the ring is cracked, hard, or deformed, replace it.
Confirm the steam release valve is in the Sealing position.

The steam release handle on the lid must point to Sealing (not Venting) for the pot to pressurise. If it is in the Venting position, steam escapes as fast as it is generated and the pot never pressurises.
Check the lid is locked correctly.

Place the lid on the pot and turn it clockwise until the lid arrow aligns with the closed/locked symbol on the pot rim. On some models you will feel and hear a click. An unlocked lid allows steam to escape around the seal.
Confirm there is enough liquid.

Instant Pot requires a minimum of 1 cup (250ml) of thin liquid to generate the steam needed for pressurisation. If cooking dry ingredients without liquid, the pot will overheat rather than pressurise.
Check the float valve for debris.

The small metal float valve must be able to rise freely when pressure builds. If the valve is sticky or has residue around it preventing it from rising, clean around it with a damp cotton swab.

An Instant Pot that will not come to pressure — the timer never starts counting down and you can see or hear steam escaping — is almost always a sealing issue rather than an electrical fault. Understanding the sealing system makes diagnosis straightforward.

How the Instant Pot Seals

Pressure builds only when steam is trapped inside the pot. Three components must work together to trap the steam: the silicone sealing ring (which fills the gap between the lid rim and the inner pot), the float valve (which rises and locks the steam in once a certain pressure is reached), and the steam release valve (which must be in the Sealing position). If any of these fails, steam escapes and pressure never builds.

The Sealing Ring: Most Common Cause

The silicone sealing ring is a consumable component. It degrades with heat cycling, absorbs odours, and can take on a permanent set (losing its round cross-section) that prevents it from filling the seal groove correctly. Instant Pot recommends replacing the ring every 12-18 months. A ring that is even slightly out of the groove — from being replaced carelessly after washing — will cause the pot to vent rather than pressurise. Always check the ring first: remove it, wash it, and reseat it carefully, pressing it into the groove all the way around the rim.

Minimum Liquid Requirement

Pressure cookers generate pressure through steam. Without sufficient liquid to vaporise, no steam can form and no pressure builds. The Instant Pot minimum is 1 cup (approximately 250ml) of thin liquid. Thick liquids like tomato sauce do not count toward this minimum — they do not generate sufficient steam. For recipes with thick sauces, always add thin liquid to the bottom of the pot in addition to the sauce.

Frequently Asked Questions

How long should it take for an Instant Pot to reach pressure?

Coming to pressure typically takes 5-15 minutes depending on the volume of food and liquid and whether the ingredients were added cold or hot. A fully loaded cold pot can take up to 20-25 minutes. If the pot has not reached pressure after 30 minutes, there is a sealing problem.

My Instant Pot is venting steam from the float valve area — is that normal?

A small amount of steam from around the float valve during the pressurisation phase is normal — it stops once the float valve rises and seals. Continuous heavy steam from the float valve area after it has risen indicates the float valve is not sealing correctly and the valve or its seal needs cleaning or replacement.