Generac 9734 troubleshooting: 35 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Generac 9734 — full specs, parts & maintenance.
| Code | Meaning |
|---|---|
| 9202-1 | Bottom out |
| 9203-1 | Bottom out |
| 9204-1 | Bottom out |
| 9205-1 | Bottom out | Out-the-side |
| 9206-1 | Bottom out | Out-the-side |
| 9207-1 | NP 6600 120/240 55/27 60 3600 | 2300 | Bottom out |Out-the-side| 89405 |
| 9290-2 | Bottom out | Bottom out |
| 9509-2 | 6600 |
| 9592-1 | 5500 120/240 Bottom out Universal |
| 9592-2 | 5500 |
| 9593-1 | 7000 120/240 Bottom out Universal |
| 9593-2 | 7000 120/240 Bottom out | Universal |
| 9600-0 | NP 6600 120/240 55/27 60 3600 | 2700 | Bottom out | Universal 92116 |
| 9600-1 | 6600 120/240 Bottom out Universal |
| 9600-2 | 6600 |
| 9677-1 | 7200 120/240 Bottom out Universal |
| 9677-2 | 7000 120/240 Bottom out Universal |
| 9677-3 | Q 7000 120/240 58/29 60 3600 | 2570 | Bottom out | Universal 92116 |
| 9677-4 | Q 7000 120/240 58/29 60 3600 | 2570 | Bottom out | Universal 92116 |
| 9712-0 | NP 5000 120/240 41/20 60 3600 | 2751 Bottom out | Universal 92116 |
| 9712-1 | NP 5000 120/240 41/20 60 3600 | 2751 Bottom out | Universal 92116 |
| 9734-1 | NP 6600 120/240 55/27 60 3600 | 2700 | Bottom out | Universal 92116 |
| 9735-1 | Q 5500 120/240 46/23 60 3600 | 2570 | Bottom out | Universal 92116 |
| 9736-1 | Q 7000 120/240 58/29 60 3600 | 2570 | Bottom out |
| LOP | Low Oil Pressure |
| HTO | High Oil Temperature |
| Symptom | Cause | Remedy |
|---|---|---|
| NO-LOAD VOLTAGE & FREQUENCY GOOD | ZERO VOLTS NO-LOAD FREQUENCY LOW OR ZERO VOLTAGE & BOTH HIGH RESIDUAL VOLTS FREQUENCY OR LOW GOOD | GO TO PROBLEM 1 GO TO PROBLEM 2 GO TO PROBLEM 3 GO TO PROBLEM 4 |
| FREQUENCY GOOD BUT VOLTAGE LOW OR RESIDUAL | TEST 2- CHECK & ADJUST ENGINE GOVERNOR GO TO TEST 6 GO TO TEST 7 | |
| FREQUENCY AND VOLTAGE BOTH READ ZERO | TEST 14- TEST 13- CHECK MAIN CIRCUIT BREAKERS MAIN CIRCUIT BREAKERS GOOD OPEN BAD CLOSE MAIN BREAKER(S) REPLACE BAD BREAKER(S) GO TO TEST 12 | |
| EXCESSIVE VOLTAGE/FREQUENCY DROOP WHEN LOAD IS APPLIED | TEST 16- CHECK LOAD WATTS & AMPERAGE TEST 15- CHECK LOAD VOLTAGE NOT OVERLOADED & FREQUENCY ; GOOD OVERLOADED END TEST | |
| PRIMING FUNCTION DOES NOT WORK | REDUCE LOAD TEST 17- CHECK ENGINE POWER TEST 19- TEST 18- TRY ENGINE STILL CRANKING THE CRANKS WON'T sen PRIMER ENGINE NORMALLY PRIME SWITCH GO TO PROBLEM 6 | |
| ENGINE WILL NOT CRANK | TEST 21- CHECK 15 AMP FUSE GOOD TEST 22- CHECK BATTERY & CABLES FUSE BAD REPLACE FUSE RECHARGE OR REPLACE BATTERY CLEAN, REPAIR OR REPLACE BAD CABLE(S) TEST 23- CHECK TEST 24- CHECK POWER SUPPLY START-STOP TO ENGINE CIRCUIT BOARD GOOD BAD CHECK WIRING AND REPLACE WIRE CONNECTIONS. DEFECTIVE REPAIR, RECONNECT SWITCH OR REPLACE BAD WIRES AS REQUIRED. TEST 26- CHECK STARTER CONTACTOR TEST 25- CHECK POWER SUPPLY TO WIRE 56 GOOD REPLACE ENGINE CONTROLLER CIRCUIT BOARD ; STARTER CONTACTOR BAD GOOD TEST 27- CHECK REPLACE STARTER MOTOR IF DEFECTIVE STARTER MOTOR | |
| ENGINE CRANKS BUT WON'T START | TEST 28- CHECK FUEL SUPPLY OF UV § WIRE 14 POWER GOOD LOW FUEL REPLENISH FUEL SUPPLY REPLACE ENGINE CONTROLLER CIRCUIT BOARD TEST 30- CHECK FUEL PUMP TEST 31- CHECK FUEL SOLENOID (Q70G MODELS ONLY) GOOD BAD REPLACE PUMP REPLACE SOLENOID TEST 32- CHECK IGNITION SPARK WEAK OR NO SPARK CLEAN AND REGAP OR REPLACE SPARK PLUG TEST 34- CHECK IGNITION POWER SUPPLY BAD REPLACE ENGINE CIRCUIT BOARD TEST 36- CHECK CARBURETION GOOD ENGINE RUNS OK NOW BAD STOP TESTS ADJUST, REPAIR OR REPLACE AS NECESSARY | |
| ENGINE STARTS HARD AND RUNS ROUGH | TEST 32- CHECK IGNITION SPARK TEST 33- CHECK ENGINE MISS IS APPARENT BAD CLEAN & REGAP OR REPLACE SPARK PLUG TEST 35- TEST IGNITION SYSTEM TEST 34- CHECK IGNITION POWER SUPPLY BAD REPLACE ENGINE CIRCUIT BOARD TEST 37- CHECK CHOKE OPERATION TEST 36- CHECK CARBURETION GOOD ENGINE RUNS OK NOW BAD STOP TESTS ADJUST, REPAIR OR REPLACE AS NECESSARY | |
| Engine Starts and Then Shuts Down | OIL LEVEL LOW | REPLENISH OIL |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: ZERO VOLTS NO-LOAD FREQUENCY LOW OR ZERO VOLTAGE & BOTH HIGH RESIDUAL VOLTS FREQUENCY OR LOW GOOD. See the table for the matching fixes.
Documented causes: OIL LEVEL LOW. See the table for the matching fixes.