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7. Secure the thermocouple with clip and screw. Connect the looped ends of the
thermocouple to the terminals with + to + (yellow wire). Chromel/Alumel thermocouples
and lead wire are easily tested with a magnet. The non-magnetic wire is positive (+) and
the magnetic wire is negative (-).
8. Replace both back covers.
9. Reconnect to power supply. Test operation of furnace.
To Replace Solid State Relay:
1. Disconnect furnace from power supply.
2. Remove back control cover. (Note connection and placement of wires to relay).
NOTE: For basic automatic control models, remove both the back cover and the front
control panel to provide access to solid state relay.
3. Disconnect wires from terminals. Identify or mark wires.
4. Remove nuts, washers, and screws from relay, then remove relay.
5. Install new relay.
6. Reconnect the wires identified or marked in step 3.
7. Replace back control cover.
8. Reconnect furnace to power supply.
9. Test operation of furnace.
To Replace Door Switch (Micro Switch):
1. Disconnect furnace from power supply.
2. Remove the four top screws on the front dial and the four bottom screws on the back
cover.
3. Slide the control section forward. (Do not pull excessively on the internal wires).
4. Disconnect the wires from the door switch. (Note connection and placement of wires to
micro switch). Identify or mark wires.
5. Remove the two screws and nuts from the micro switch.
6. Insert new micro switch and secure with screws and nuts removed in Step 5.
7. Reconnect wires identified or marked in Step 4 to new door switch.
8. To realign door switch see below, steps 5 through 7.
9. Slide control section back and replace the screws described in Step 2.
10. Reconnect to power supply.
11. Test operation of door switch. (See below, step 10.).
To Realign Door Switch (Micro Switch):
1. Disconnect furnace from power supply.
2. Remove the four top screws on the front dial and the four bottom screws on the back
cover.
3. Slide the control section forward. (Do not pull excessively on the internal wires).
4. With the door closed loosen the screws on the microswitch and slide the switch
downward, so that the screws are at the bottom of the slots in the mounting bracket.
5. Finger tighten both screws. While holding down the rear of the micro switch housing,
gently push up on the front switch until you hear a click.
6. Open and close the door; the switch should click when the door is opened approximately
1" and 1/2" to 1" before the door is closed. Slide the front of the switch up to increase the
distance, down to decrease the distance.
7. Tighten the two screws to secure the micro switch. Check the operation of the switch as
described in Step 6 after tightening the screws.
8. Slide control section back and replace the screws described in Step 2.
9. Reconnect to power supply.
10. To test the operation of the door switch: turn the power switch on, set the control to c
setting high enough to keep the control from cycling, open and close the door; the cycle
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