Just tested the thermocouple on a
Robert Shaw 7000 series gas valve.
As described here, we got 27--30 mV
from the thermocouple tip when
heated with the pilot flame but when
screwed to the gas valve, the
thermocouple tip presses onto the
end of two heavy gauge wires that
seem to go up to some other point
in the wall furnace.
What is the purpose of those two wires?
Without them the pilot stayed lit
and gas valve seemed to
It seems difficult to understand a
circuit when the tips of the two wires are
pressed together by the end of the
Is this a safety feature or a
necessary part of the operation?