Question: The warning „emergency stop“ appears on the display at 120°C, why?

The emergency shutdown kicks in at 120 °C in order to prevent overheating of the machine, which caused by onforseen behaviour of the software or hardware. After the temperature has dropped below 100 °C, the PID will resume normal operation. When in steam mode, this message will apear regulary (temp. above 120 °C), but doesn’t influence the function of the machine since steam is not controlled by the PID.

Question: why does the heating SSR not function properly?

A common mistake is that the signal pin is not connected to “+”, but to the “-“ connector of the SSR. Please double check if you have connected the SSR correctly

Question: My PID values don’t seem to work, e.g. the temperature overshoots

Please have a look at our PID-value list PID-values, where many working values are listed for cold-start, normal operation and brew-detection. In case you want to ask for help in the chat, please explain the exact problem (best would be to also send the values from Blynk).

Question: My microcontroller seems to detect brews and brew stops, and randomly switches between those two at frequent intervals. Why?

Dependig of the level of expansion you chose (PID only to full expansion), you might need the resistor R6 for your build. Also check that you solder-bridged JP2 correctly on the back side of the PCB base board (see JP2 starting with PCB version 1.5).