Specifications

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To Replace Solid State Relay:
a. Disconnect furnace from power supply.
b. Remove the screws on the front dial and the screws on the lower back cover.
c. Remove the upper back cover.
d. Disconnect the element lead wires and one ground wire from back of furnace. Also, disconnect T/C
lead wire from terminal block. (Note placement and connection of of wires).
e. Slide control section forward and disconnect two wires from door switch. (Note placement and
connection of wires).
f. Control section can now be removed from furnace housing.
g. Relay is mounted on heat sink on back of control section. Disconnect wires from relay and remove
relay. (Note placement and connection of wires).
h. Install new relay.
i. Reverse steps a - e to reassemble furnace.
j. Test operation of furnace.
To Replace Door Switch (Microswitch):
a. Disconnect furnace from power supply.
b. Remove the four top screws on the front dial and the four bottom screws on the back cover.
c. Slide the control section forward. (Note: do not pull excessively on the internal wires).
d. Disconnect the wires from the door switch. (Note connection and placement of wires to Microswitch).
e. Remove the two screws and nuts from the Microswitch.
f. Insert new Microswitch and secure with screws and nuts removed in Step e.
g. Reconnect wires identified or marked in Step c to new door switch.
h. To realign door switch see To Realign Door Switch (Microswitch) steps e through g.
i. Slide control section back and replace the screws described in Step b.
j. Reconnect to power supply.
k. Test operation of door switch. ( To Realign Door Switch (Microswitch) Step f).
To Realign Door Switch (Microswitch):
a. Disconnect furnace form power supply.
b. Remove the four top screws on the front dial and the four bottom screws on the back cover.
c. Slide the control section forward. (Note: do not pull excessively on the internal wires).