Comet Executive Gas Troubleshooting
6-5
WARNING
Only trained personnel with experience
in gas, electrical or mechanical repair
should troubleshoot and repair the unit.
Troubleshooting
WARNING
Read the REPAIR chapter and make
sure that the power is disconnected
before doing any repairs.
ISSUE POSSIBLE CAUSE SOLUTION
Unit Jogs, Does Not Start
1. Fuse protecting T1 blown. • Replace any blown fuses.
• If fuses continue to blow:
- Check the wiring for a short or open
circuit.
- Replace defective component(s) as
required.
2. START button is defective. • Check for 24 VAC at the green START
button switch. Replace the switch if 24
VAC is present and the switch does not
operate.
3. CR1 is defective. • Repair or replace the auxiliary contact.
4. 24 VAC transformer T1 is
defective.
• Check for 24 V output. Replace the
transformer if there is no 24 V output.
WARNING
Never operate the unit unless all safety devices are working correctly.
5. STOP button or the red
safety nger guard is
pushed in and stuck or
defective.
• Replace any defective STOP button.
• Make sure the nger guard is installed
correctly and not depressed.
• Check the nger guard switches inside
both endframes.
6. The protective backplate is
o or the safety interlock
switch is otherwise open.
• Push in the plungers to the safety inter-
lock switches.
• Close and secure the endframe doors
and the protective plate.
Unit Starts, Does Not Jog
1. JOG REVERSE button is
defective.
• Check for 24 VAC at the JOG REVERSE
button.
No Speed Adjustment
1. Short or open circuit in the
wiring.
• Inspect the wiring for a short or open
circuit. Replace any defective wires.
2. Loose connection at
SPEED knob or inverter.
• Tighten all connections at the SPEED
knob and the AC frequency inverter.
3. SPEED knob potentiom-
eter is bad if it will not vary
the speed.
• Replace the SPEED knob potentiometer.
4. AC frequency inverter mo-
tor control is malfunctioning
if there is no motion.
• Call the factory Service Department for
instructions.
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