February 15, 2019
250-7690B
18
CASTILE INS
9
Thermocouple
TECH TIP:
SET VOLT METER TO
MILLIVOLTS (DC)
PLUG IN STOVE
YES
NO
IS THE GREEN CALL
LIGHT ILLUMINATED
ON THE CONTROL
BOX?
IS THERE A
FIRE IN THE FIRE
POT?
IS THERE
3mVDC AT THE
THERMOCOUPLE
WIRE
CONNECTION
POINTS AT THE
JUNCTION BOX?
YES
YES
NO
NO
ARE THE
TERMINAL
CONNECTIONS
ON THE
JUNCTION BOX
LOOSE?
SECURE
THERMOCOUPLE
WIRE ENDS
PROPERLY.
REPLACE THE
THERMOCOUPLE
REPLACE THE
CONTROL BOX
NOTE:
The thermocouple is made up of two dissimilar metals that when joined together will produce a small
amount of electricity when heat is applied. The hotter the fire the higher the voltage produced; topping out
at 30 millivolts (DC) while the stove is burning on high. The function of the thermocouple is to sense the
temperature in the fire pot; if the thermocouple is fractured, it will not produce voltage.
