Service and Parts | 7-3
Thermocouple Replacement
Disconnect power from the sensor and control unit and allow the sen-
sor to cool before replacing parts inside the sensor.
To remove the thermocouple, do the following:
1. Disconnect thermocouple wires (red and yellow) from terminals C and D on
the sensor board and pull these wires through the conduit hole connecting the
sensor board to the sensor. You need to first loosen the cable clamp nut in the
sensor board that holds these two wires in place.
2. On the furnace assembly, remove the screw and accompanying lock washer
from the thermocouple mounting tab (save the screw and lock washer for when
you insert the new thermocouple).
3. Pull the thermocouple straight up and remove it from the furnace.
4. Insert the new thermocouple into the slot in the top of the furnace (the ther-
mocouple should orient to the right as you face the front of the unit). It should
go in freely; if necessary, wiggle a little to position without forcing it in.
5. Place the lock washer and screw on the thermocouple mounting tab and tight-
en.
6. Feed the thermocouple wire through the conduit hole, and reconnect thermo-
couple wires to the terminal board (red wire to D, yellow wire to C), and tighten
the cable clamp nut.
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