I am having same problems, and it is already October!
Checked thermocouple: ca. 25mV witout load of the coil.
But only 12 mV with load connected, taken at the termocouple.
Mounted a new thermocouple: no change
Further I loose 3 mV over the wire from the thermocouple to the coil. So this leaves only 9 mV for the coil: not enough
Checked the coil; looks ok.
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