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Inaccurate temperature display. Oxidized or contaminated
thermocouple.
Improper loading.
Ambient temperature too high.
Poor thermocouple connection.
Solid state relay malfunction.
Thermocouple connections
reversed.
Control out of calibration.
Replace thermocouple.
Use proper loading procedures.
Refer to start-up procedure.
Keep ambient temperature under
100°F.
Tighten connections.
Replace solid state relay.
Reconnect thermocouple correctly.
Contact Thermolyne.
To Replace a Heating Element:
1. Disconnect furnace from power supply.
2. Remove the back terminal cover of the furnace. (Note placement and connections of
wires)
3. Loosen the nuts on the terminals of the element to be replaced.
4. Open the door and pull the defective element out. (It may be easiest to turn the furnace
so that the element to be removed is on top).
5. Slide the new element into place, threading the leads through the insulating porcelain
bushing on the back of the furnace.
6. Tighten the nuts securely. Cut off any excess lead wire.
7. Replace the back terminal cover.
8. Reconnect furnace to power supply.
9. Test operation of furnace.
To Replace a Platinel II Thermocouple in Programmable and Automatic Furnaces:
1. Disconnect furnace from power supply.
2. Remove the back terminal cover of the furnace. (Note placement and connection of
wires).
3. Remove the screws on the thermocouple terminals and pull the thermocouple straight
out.
4. Insert the new thermocouple into the furnace with blue and yellow beaded lead
connected to the positive (+) marked terminal and other lead to negative (-) terminal.
5. Secure connections with screws removed in step 3.
6. Replace the back terminal cover.
7. Reconnect the furnace to power supply.
8. Test operation of furnace.
To Replace a Chromel/Alumel Thermocouple (Basic Automatic Furnaces):
1. Disconnect furnace from power supply.
2. Remove both back covers. (Note placement and connection of wires).
3. Remove clip holding thermocouple in place (1 screw) and remove the two screws on the
thermocouple terminals.
4. Remove the thermocouple. Pull thermocouple straight out of hole in the chamber first to
avoid damage to the insulation.
5. Guide the looped ends of the new thermocouple through the plastic bushings with the red
(-) lead to the right as you face the back of the furnace.
6. Form a 90° bend, towards the furnace, between the 2" long and 1” long ceramic
insulators with the red (-) lead to the right. Insert the thermocouple straight through the
hole in the chamber.
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