Troubleshooting
Relieve pressure; page 5.
PROBLEM | CAUSE | SOLUTION |
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E=XX is displayed | Fault condition exists | Determine fault correction from table, page 14. |
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Engine won’t start | Engine switch is OFF | Turn engine switch ON |
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| Engine is out of gas | Refill gas tank. Honda Engines Owner’s Manual. |
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| Engine oil level is low | Try to start engine. Replenish oil, if necessary. |
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| Honda Engines Owner’s Manual. |
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| Spark plug cable is disconnected or damaged | Connect spark plug cable or replace spark |
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| plug |
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| Cold engine | Use choke |
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| Fuel shutoff lever is OFF | Move lever to ON position |
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| Oil is seeping into combustion chamber | Remove spark plug. Pull starter 3 to 4 times. |
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| Clean or replace spark plug. Start engine. |
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| Keep sprayer upright to avoid oil seepage. |
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False tripping of WatchDog | Operating conditions out of WatchDog param- | Turn pressure down. Contact Graco Technical |
system. EMPTY is displayed. | eters | Assistance to adjust WatchDog parameters. |
Pump does not run. | Low pump output; page 7. | Operate without WatchDog active; Manual |
| 309408. | |
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Engine operates, but dis- | Error code displayed? | Reference pressure control repair. Page 15. |
placement pump does not |
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operate |
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| Pump switch is OFF | Turn pump switch ON. |
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| Pressure setting is too low | Turn pressure adjusting knob clockwise to |
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| increase pressure. |
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| Fluid filter (318) is dirty | Clean filter. Page 24. |
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| Tip or tip filter is clogged | Clean tip or tip filter. Manual 309091. |
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| Displacement pump piston rod is stuck due to | Repair pump. Manual 309277. |
| dried paint |
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| Connecting rod is worn or damaged | Replace connecting rod. Page 8. |
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| Drive housing is worn or damaged | Replace drive housing. Page 9. |
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| Electrical power is not energizing clutch field | Check wiring connections. Page 13. |
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| Reference pressure control repair. Page 15. |
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| Reference wiring diagram. Page 25. |
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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 |
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| and measure resistance across clutch coil. At |
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| 70_ F, the resistance must be between 1.2 |
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| ±0.2Ω (GMax 3900); 1.7 ±0.2Ω (GMax 5900); |
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| if not, replace pinion housing. |
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| Have pressure control checked by authorized |
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| Graco dealer. |
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| Clutch is worn, damaged, or incorrectly | Replace clutch. Page 10. |
| positioned |
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| Pinion assembly is worn or damaged | Repair or replace pinion assembly. Page 10. |
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