critical Keurig

Error Code 4

The float switch is lower than it should be while the CWT inlet valve is open and the time limit is exceeded.

? What Causes This

Inlet water disconnected, low water pressure, Inlet Valve not opening, CWT level sensor stuck low, or Leaks.

✓ How to Fix It

Check that the inlet water supply is connected and turned on with adequate pressure. Verify the inlet valve is functioning properly. Contact your Keurig Authorized Distributor if the issue persists.

Source: page 16 of the official manual

From the manual

This error code appears in:

Keurig Coffee Maker