Section 5 — Troubleshooting
Guardian
TROUBLESHOOTING POINTS
PROBLEM | CAUSE | CORRECTION | ||
Engine won’t crank. | 1. | 15 amp fuse blown. | 1. | Replace fuse. |
| 2. | Loose or corroded or defective | 2. | Tighten, clean or replace |
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| battery cables. |
| battery cables as necessary. |
| 3. | Defective starter contactor. | 3. | Replace contactor. |
| 4. | Defective starter motor. | 4. | Replace starter motor. |
| 5. | Dead or Defective Battery. | 5. | Remove, change or replace battery. |
| 6. | 4 amp fuse blown. | 6. | Replace fuse. |
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Engine cranks, but won't start | 1. | Out of fuel. | 1. | Replenish fuel. |
| 2. | Fuel solenoid (FS) is defective | 2. | Replace solenoid. |
| 3. | Open Wire #14 from Engine Control | 3. | Reconnect wire. |
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| circuit board. |
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| 4. | Spark plugs defective. | 4. | Clean, regap or replace plugs. |
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Engine starts hard, runs rough. | 1. | Flame arrestor (air cleaner) plugged or | 1. | Clean or replace as needed. |
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| damaged. |
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| 2. | Plugged fuel line. | 2. | Unclog fuel line. |
| 3. | Defective spark plugs. | 3. | Clean, regap or replace plugs. |
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Engine starts, then shuts down. | 1. | Engine oil level is low. | 1. | Check oil and add oil as needed. |
| 2. | Engine is overheated. | 2. | Check cooling system for leaks. |
| 3. | Defective Low Oil Pressure Switch | 3. | Replace switch. |
| 4. | Defective Coolant Temperature Switch | 4. | Replace switch. |
| 5. | Defective Control Module circuit board. | 5. | Replace board. |
| 6. | Coolant Level is Low. | 6. | Repair leak - Add coolant. |
| 7. | Defective Low Coolant Level Switch | 7. | Replace Switch. |
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AUTO/OFF/MANUAL Switch at, | 1. | Defective AUTO/OFF/MANUAL switch | 1. | Replace switch. |
OFF engine continues to run | 2. | Open/disconnected wire #15A between | 2. | Reconnect/close wire. |
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| AUTO/OFF/MANUAL switch and Control |
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| Module circuit board. |
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| 3. | Defective Control Module circuit board | 3. | Replace board. |
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No AC output from generator. | 1. | Check main line circuit breaker. | 1. | Reset to ON or CLOSED. |
| 2. | Check circuit breaker & fuses. | 2. | Reset and replace, if necessary. |
| 3. | Transfer switch set to NORMAL position | 3. | Set to GENERATOR position. |
| 4. | Generator internal failure. | 4. | Contact an Authorized Generac |
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| facility. |
| 5. | Thermal circuit breaker open. | 5. | |
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| attempt restart. |
Generac® Power Systems, Inc. 23
