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Machine is screaming for descaling. The Calcium deposits in the system are slowing down heating.
Do not think of using Vinegar.
Do not use R.O water or consider water is very soft in your area. There is nothing like that.
A) Heater Element - Open Circuit or Wire Broken (Corrosion at crimp(s),
B) OVER Temp Thermostat OVERLOAD.
IF the element does not get hot enough (The amount of power (measured in Watts) consumed is not close to the Nameplate rating, then the element is weakening inside.
IF it stays cold, then it is gone completely, however you indicate that after 3 minutes (the usual time??) the brewing stops.
MOST designs have a water heater fused to a "Hotplate" type warming pad.
There are two temperature sensitive valves built into the flow of water. A Low Temp that closes when the water is about 30c. A HIGH temp valve that opens at 70C. Between the two valves, the water gets heated to 90C then pumps over the drip basket.
Along the way, is an OVER TEMP that trips at 105C, and stops the heater function (After the coffee is brewed, and the reservoir is empty.)
The CW series brewers do not have level probes they run strictly on a timer and a solenoid to control the water flow. So, that said, the problem could be the solenoid. If the brewer constantly drips/runs even when the front "ON/OFF" switch is off then it is the solenoid. If the brewing stops with switch off then it is the timer. The timer is located in the panel behind the filter basket on the front of the machine (6 screws) If the brewer has a manual timer set it to about 2 minutes, a good starting point for a pot of water (1/2 gallon). If it stops brewing then you need to fine tune the timer to give you right amount of water for your brewing method. If it doesn't stop... then you will need a new timer. If your brewer does NOT have a "dial/manual" timer follow the instructions on the backside of the panel to "reset" the brew level. If it does not reset you will need a new control board. Hope this helps.
Sounds like the brew unit is blocked, to be sure try this, use the pre grounds button to brew a coffee, if no water comes out then it is the brew unit, remove unit and look under red o-ring, you will see a shower screen, clean shower and tube that flows to the discharge(top, you will have to remove the 2 screws up there, be careful not to lose the small plastic ball under the spring). Reassemble and try again.
This may be one of two issues:
1. The pump is malfunctioning which can cause the internal reservior to not completely fill which causes issues during brewing. My unit dribbled random amounts of water instead of brewing for about a week before the pump died completely.
2. The puncture seal isn't in the right position. Open the Keurig fully so you can see the sharp puncture pin. Very Carefully push the black rubber gasket around it all the way up. Then pull it back down about 1/16". Brew a cup, if the problem continues, try sliding the gasket further down by increments of 1/32".
some of these coffee makers have feed tubes, which can be seen in the rear water reservoir, that feed the hot water to the grounds. some of these tubes collapse when the boiling water passes through them , then kink , causing the water to stop flowing untill it either cools or is straightened. To check and see if this is occuring.. look in the back reservoir, if there's a tube running through it, note how soft it gets as it starts to brew.. be careful the water inside the tube is hot.. This indentify why it stops brewing partway though..
Sounds like dosage is too high and grind is too fine.
Rule of thumb with any saeco unit.
Do not grind any finer then 2 or your looking for trouble.
Open grinder, clean it out with a vac. Slapped it back on.
The reason it stops is grind is too fine, and the machine doesn't have enough pressure to pass threw the grinds, creates back pressure in the machine and the unit failsafes after a certain amount of time with and pressure.