Troubleshooting Tips and Part # Information

Even though fuses are OK and power is connected to machine (i.e. neither drive motor nor cooling fan will turn on.)

Possible Cause: Loose Set Screw on Rotary Safety Interlock: Check set screw on safety interlock (for '97 and '98 machines). The rotary interlock switch is sensitive and will not function if set screw connecting it to the Door Closer Arm becomes loose. This interlock was replaced with a standard magnetic switch on post-1998 machines.

Solution: Reposition switch shaft and tighten screw. Machine should stop when door is open & operate when door is closed.

Possible Cause: Heating Element wires may be loose or element is burned out.

Check connections at temperature controller. If both are tight, disconnect and check for continuity across heat element wires.

Solution: If no continuity, replace Heater Harness Assembly.

Possible Cause: Thermocouple wires are loose or broken. Check thermocouple wires at temperature controller. Make sure connections are tight. If they are and "E-7" error still appears, detach wires from temperature controller and check for continuity across thermocouple wires.

Solution: If no continuity, replace thermocouple (i.e. Heater Harness Assembly.)

(or operates intermittently) and Fuses #1 & #2 Blow frequently. Motor controller may display odd message and/or no message.

Possible Cause: Short circuit in motor controller. Remove fuses 1 & 2. Check resistance across terminals 7 & 8. Resistance should be high. If resistance is 0, then there is a short in the motor controller. Also, should have 8-20 ohm resistance across terminals 10 & 11, 10 & 12, and 11 & 12, otherwise there is likely a short circuit in the motor controller.

Solution: Replace motor controller module.

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