MilTouch™ 3 and later E-P Plus® machines are equipped to help diagnose when your temp probe has failed. One of the following three conditions must be met to receive a "Probe Fails" error:
- The temp probe reads 0° (open probe circuit)
- The temp probe reads above the max allowable temperature for the machine model, 205° / 190° (shorted probe circuit).
- The temp probe reads 20° above the desired temperature for more than 20 seconds. (shorted probe circuit, open steam valve, or hot water valve)
As a side note, all electronic temp controls (since the 1980's) diagnose a probe failure with an error message of "temperature probe failed". Early controls only detected an open or shorted probe or possibly a temp over 212 due to a steam valve leak.
Real World Example for Miltouch™ 3:
Looking at the image below, this actual temperature is 25° above the set point at 21 seconds into Step 3.
In this situation, Step 2 ,previous to the displayed step, was programmed for Hot Water "ON" and Cold Water "OFF" with no set point so the temperature was HOT. Step 3 was set for a split water fill, Hot and Cold Water both "ON", with a set point of 90°. The goods still retained heat from Step 2, and Step 3 did not allow the temp to come down to the set point of 90 degrees (or within 20 degrees). Step 3 really needed a modulating fill.
Setting Hot Water to "Raise Fill Temp" and Cold Water "ON" will add hot water when the machine is below set point. This concept would modulate the water and allow for more exacting temperature fills.
Remember, process control is important.
Control the water, control the process.
