!!
critical Keurig
Error Code 1
Brew Tank TCO is Open (no Heater on brew tank).
? What Causes This
Draining and forgetting to refill or Bad Triac.
✓ How to Fix It
Refill the brew tank if it was drained. If the issue persists, contact your Keurig Authorized Distributor as the Triac may be faulty.
Source: page 16 of the official manual
From the manual
This error code appears in:
Keurig Coffee Maker