Troubleshooting
Troubleshooting
Problem | Cause | Solution |
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E=XX is displayed | Fault condition exists. | Determine fault correction from table, page 31. |
Engine will not start | Engine switch is OFF. | Turn engine switch ON. |
| Engine is out of gasoline. | Refill gas tank. Honda Engine Manual. |
| Engine oil level is low. | Try to start engine. Replenish oil, if necessary. |
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| Honda Engine Manual. |
| Spark plug disconnected or damaged. | Connect spark plug cable or replace spark |
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| plug. |
| Engine is cold. | Use choke. |
| Fuel shutoff lever is OFF. | Move lever to ON position. |
| Oil is seeping into combustion cham- | Remove spark plug. Pull starter 3 to 4 times. |
| ber. | Clean or replace spark plug. Start engine. |
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| Keep sprayer upright to avoid oil seepage. |
False tripping of WatchDog system. | Operating conditions out of WatchDog | Turn pressure down. Contact Graco Technical |
EMPTY is displayed. Pump does not | parameters. | Assistance to adjust WatchDog parameters. |
run. |
| Operate without WatchDog active (see Opera- |
| Pump output is low, page 23. | tion manual). |
Engine operates, but displacement | Error code displayed. | See Digital Display Messages, page 31. |
pump does not operate |
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Pump switch is OFF. | Turn pump switch ON. | |
| Pressure setting too low. | Turn pressure adjusting knob clockwise to |
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| increase pressure. |
| Fluid filter is dirty. | Clean filter. |
| Tip or tip filter is clogged. | Clean tip or tip filter (see gun manual). |
| Displacement pump piston rod is stuck | Repair pump (see pump manual). |
| due to dried paint. |
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| Connecting rod is worn or damaged. | See Parts manual. |
| Drive housing is worn or damaged. | See Parts manual. |
| Electrical power is not energizing clutch | See Parts manual. |
| field. | See Digital Display Messages, page 31. |
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| With pump switch ON and pressure turned to |
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| MAXIMUM, use a test light to check for power |
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| between clutch test points on control board. |
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| Remove clutch wires from control board and |
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| measure resistance across clutch coil. At 70° |
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| F, the resistance must be between for 3900 - |
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| 1.2 + 0.2 Ω, for 5900/7900 1.7 ± 0.2 Ω; if not, |
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| replace pinion housing. |
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| Have pressure control checked by authorized |
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| Graco dealer. |
| Clutch is worn, damaged, or incorrectly | Adjust or replace clutch. See page 32. |
| positioned. |
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| Pinion assembly is worn or damaged. | Repair or replace pinion assembly. Page 32. |
22 | 332919C |
