Section 5 — Troubleshooting
Guardian
5.1TROUBLESHOOTING GUIDE
PROBLEM | CAUSE | CORRECTION | ||
The engine will not crank. | 1. | Fuse blown | 1. | Replace fuse. |
| 2. | Loose, corroded or defective | 2. | Tighten, clean or replace |
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| battery cables |
| as necessary. |
| 3. | Defective starter contactor | 3. | * |
| 4. | Defective starter motor | 4. | * |
| 5. | Dead Battery | 5. | Charge or replace battery. |
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The engine cranks but | 1. | Out of fuel | 1. | Replenish fuel. |
will not start. | 2. | Defective fuel solenoid (FS) | 2. | * |
| 3. | Open #14 wire from | 3. | * |
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| engine control board |
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| 4. | Defective spark plug(s) | 4. | Clean, |
| 5. | Dirty/Blocked air filter | 5. | Clean or replace as required. |
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The engine starts hard | 1. | Air cleaner | 1. | Check, clean or replace air cleaner. |
and runs rough. |
| plugged or damaged |
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| 2. | Defective spark plug(s) | 2. | Clean, |
| 3. | Dirty/Blocked air filter | 3. | Clean or replace as required. |
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The engine starts, but then | 1. | Engine oil level low | 1. | Check oil and add oil as needed. |
shuts down. | 2. | Defective low oil | 2. | * |
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| pressure switch |
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| 3. | Defective high temperature | 3. | * |
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| switch |
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| 4. | Defective control board | 4. | * |
| 5. | Low coolant level | 5. | Check coolant level, repair leaks |
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| and refill. |
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The Auto/Off/Manual switch | 1. | Defective switch | 1. | * |
is set to OFF, but the engine | 2. | Defective control board | 2. | * |
continues to run. |
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There is no AC output from | 1. | Generator main line circuit | 1. | Reset circuit breaker |
the generator. |
| breaker open |
| to ON (or closed). |
| 2. | Generator internal failure | 2. | * |
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There is no transfer to | 1. | Generator main line circuit | 1. | Reset circuit breaker |
standby after utility |
| breaker open |
| to ON (or closed). |
source failure. | 2. | Defective transfer switch coil | 2. | * |
| 3. | Defective transfer relay | 3. | * |
| 4. | Transfer relay circuit open | 4. | * |
| 5. | Defective control logic board | 5. | * |
*Contact your nearest Generac/Guardian Authorized Dealer for assistance.
20 Generac® Power Systems, Inc.