Critical Error Messages
ERROR
MEANING/LIKELY CAUSES
1
Brew Tank TCO is Open
(no Heater on brew tank).
Likely Causes: Draining and
forgetting to refill.
Or Bad Triac.
2
Preheat Tank TCO is Open
(no Heater on preheat tank).
Likely Causes: Draining and
forgetting to refill.
Or Bad Triac.
3
The Brewer must be descaled now:
When 4 dispense cycles in a row take longer
than expected to brew, the brewer displays
this error message. This error message lets
the user know damage may occur if they do
not descale now.
4
The float switch is lower than it should
be while the CWT inlet valve is open and
the time limit is exceeded.
Likely Causes: Inlet water disconnected.
Or low water pressure.
Or Inlet Valve not opening.
Or CWT level sensor stuck low. Or Leaks.
MENU TEXT
ERROR
BREW TCO OPEN
HWT DRAINED
MODULES: POWER, HWT
PREHAT TCO OPEN
HWT DRAINED
MODULES: POWER, HWT
DESCALE REQUIRED
CHECK WATER SUPPLY
MODULES: POWER, CWT
If any problems persist, contact your Keurig Authorized Distributor.
16
MEANING/LIKELY CAUSES
5
The float switch is sensed higher than it
should be during a brew cycle. The inlet
valve might be stuck open, and the Float
Switch is now preventing flooding.
Likely Causes: Leaky/Stuck Inlet Valve.
Or CWT level sensor stuck high.
6
The Preheat Tank thermistor reading is
<37°F. The heater will not turn on until
it reads above this threshold. This is to
protect against damage.
Likely Causes: The brewer just stored at
cold temperature.
Or bad Thermistor.
7
Same as above for Brew Tank.
8
Thermistor in the Preheat Tank reads >240°F.
Likely Causes: Problems with thermistor.
Or heater triac.
9
Same as above for Brew Tank.
MENU TEXT
RUNAWAY FILL
MODULES: POWER, CWT
PREHEAT TANK COLD
MODULES: HWT
BREW TANK COLD
MODULE: HWT
MODULES: POWER, HWT
MODULES: POWER, HWT