This error message indicates the coffee Thermoblock is not reaching the required temperature to brew coffee. For Jura coffee machines without a LED screen, the following will occur:
A-Line: The descaling symbol or water filter symbol will light up for a few seconds and then the machine will shut off.
C5: All symbols will be flashing, which may also indicate the Brew Group failed to initialize. Refer to Error 8.
ENA-Micro: The descaling symbol or water filter symbol will light up for a few seconds and then the machine will shut off.
The following parts may be the cause of the problem:
Possible Faulty Parts:
The Temperature Sensor on the Thermoblock is defective. The Temperature Sensor monitors the temperature and relays the readings to the CPU. Over time, continuity between the sensor and Thermoblock weakens. If the machine is reading "error 2" during the initial heating process, then you may need to replace this part.
Visually check the temperature sensor and contact pins for corrosion. The contact that connects to the boiler will have a coffee-colored bubble significantly protruding from the connection if the sensor is nearing malfunction. Replace the temperature sensor. Also, check the OHMs reading to ensure there is a connection.
The Over-Temperature Protection is defective or blown. This fuse is a shut off mechanism when the Thermoblock exceeds the max temperature, or there is a power surge during the brew process. If this fuse is blown, it may indicate there is an underlying problem in the circuit.
Visually check the fuse and contact pins for corrosion. Also, check the OHMs reading to ensure there is a connection. It is recommended to replace the temperature sensor and fuse.
The Coffee Thermoblock is defective. Over time, the Thermoblock may become clogged with scale, preventing it from reaching the required temperature.
Replace the Thermoblock, sensors and fuses.
The Power Board is defective. The board is failing to receive the necessary signal that the coffee thermoblock has reached the required temperature to initiate the brew process.
Replace the PCB; however, it is more economical to buy a new or refurbished machine.