Troubleshooting and Diagnostics
DANGER 
HAZARDOUS VOLTAGES CAN CAUSE SEVERE INJURY OR DEATH.
These charts may indicate problems that require authorized GE Zenith service personnel.
Hazardous voltages may exist on termination plugs other than those that go into the MX150.
General Troubleshooting
The following troubleshooting guide is used to recognize, and determine basic faults. When using this guide, it will ask several questions about the condition of the switch. This guide will then list an order of the possible faults. You will then look at the first suspected fault to determine if it is the problem. If it is not a fault, you go to the second suspected fault. If you go through all of the
suspected faults, or the chart instructs you to, call a GE Zenith Representative for further assistance.
NOTE: When you use the troubleshooting charts, the Annunciation column refers to the LED’s on the control panel.
Symptom | Annunciation | Possible Cause(s) | Corrective Action | |
Engine does not START | SOURCE 2 | Engine start wires not | Check engine start connections | |
| AVAILABLE | terminated properly |
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| LED off |
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| Generator is in OFF position | Investigate why Engine Control | ||
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| Switch was turned off | |
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Engine does not stop | LCD Display - | U timing cycle not complete | Check U timer setting | |
| “TD Engine Cool Down” |
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| SOURCE 1 POSITION, and | Engine start wires not | Check Engine Start Connections | |
| SOURCE 1 and SOURCE 2 | terminated correctly |
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| AVAILABLE LEDs on, |
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| Generator in MANUAL | Place generator in AUTO | ||
| but U timer has timed out | |||
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ATS will not transfer | SOURCE 2 AVAILABLE | SOURCE 2 voltage or frequency | Check: Engine Start Connections, | |
to SOURCE 2 | LED off | not within acceptable parameters | Generator Breaker, Generator Output, | |
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| and Engine Control Switch | |
ZTG Series |
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| None | Power supply connector unplugged | Plug in connector | |
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| LCD Display - | W timing cycle not complete | Check W Timer setting | |
| “S1 _ _ _ _ TD XFR S1>S2 |
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| Time Remaining _ _ _ _” |
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ATS will not transfer | LCD Display - | DW timing cycle not complete | Check DW Timer setting | |
to SOURCE 1 | “ATS Open |
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| Time Remaining _ _ _ _” |
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ZTGD Series |
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| SOURCE 1 AVAILABLE | SOURCE 1 voltage or frequency | Check utility and utility breakers | |
| LED off | not within acceptable parameters |
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| None | Power supply connector unplugged | Plug in connector | |
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| LCD Display - | Limit switch or RT box | Call Technical Services | |
| “Diagnostic Code 001” | connector unplugged |
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| LCD Display - | T timing cycle not complete | Check T Timer setting | |
| “S1 OK |
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| Time Remaining _ _ _ _ |
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| Bypass” |
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| LCD Display - | TD timing cycle not complete | Check DT Timer setting | |
| “ATS Open |
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| Time Remaining _ _ _ _” |
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■ 24 | ZTG/ZTGD Operation and Maintenance Manual | GE Zenith Controls ■ |