MAX31855 with washer thermocouple problem
I have a MAX31855 breakout board that I am using with a washer type thermocouple so that I can attach it to a boiler.
When the thermocouple is sitting in air, it reads fine, however when I attach it to the boiler, the serial display indicates a problem with the thermocouple.
I have connected the GND of the boiler to the Arduino & MAX31855 GND.
I have tried putting Mica washers between the washer and the boiler, also between the washer and the screw with zero success.
Thanks in advance for any assistance.