The H-100 is a generator-set controller. It is used on generator sets from Generac and Magnum, including the QT 130, QT 130kW, QT 6.8L 100kW and QT 6.8L 70kW.
Used across brands: Generac, Magnum
| Code | Meaning |
|---|---|
| 15 | Engine won't crank. |
| Symptom | Cause | Remedy |
|---|---|---|
| AUTO/OFF/MANUAL Switch at OFF, engine continues to run. | Defective AUTO/OFF/MANUAL switch. Open/disconnected wire #15A between AUTO/OFF/MANUAL switch and Control Module circuit board. Defective Control Module circuit board. | 1. Replace switch.* 2. Reconnect/close wire. 3. Replace board.* |
| Engine cranks but won't start | Out of fuel. Fuel solenoid (FS) is defective. Open Wire #14A from Engine Control circuit board. Spark plugs defective. Door on tank not closed. | 1. Replenish fuel. 2. Replace solenoid.* 3. Reconnect wire. 4. Clean, regap or replace plugs. 5. Close door on tank. |
| Engine cranks but won't start. | 1. Out of fuel. 2. Fuel solenoid (FS) is defective. 3. Open Wire #14A from Engine Control circuit board. 4. Spark plugs defective. 5. Door on tank not closed. | 1. Replenish fuel. 2. Replace solenoid. 3. Reconnect wire. 4. Clean, regap or replace plugs. 5. Close door on tank. |
| Engine starts hard, runs rough. | Flame arrestor (air cleaner) plugged or damaged. Plugged fuel line. Defective spark plugs. Fuel pressure incorrect. | 1. Clean or replace as needed. 2. Unclog fuel line. 3. Clean, regap or replace plugs. 4. Confirm fuel pressure to regulator is as recommended in SPECIFICATIONS. |
| Engine starts then shuts down. | Engine oil level is low. Engine is overheated. Defective Low Oil Pressure Switch. Defective Coolant Temperature Switch. Defective Control Module circuit board. Coolant Level is Low. Defective Low Coolant Level Switch. | 1. Check oil and add oil as needed. 2. Check cooling system for leaks. 3. Replace switch.* 4. Replace switch.* 5. Replace board.* 6. Repair leak - Add coolant. |
| Engine won’t crank. | 15 amp fuse blown. Loose or corroded or defective battery cables. Defective starter contactor. Defective starter motor. Dead or Defective Battery. 5 amp fuse blown. | 1. Replace fuse. 2. Tighten, clean or replace battery cables as necessary. 3. Replace contactor.* 4. Replace starter motor.* 5. Remove, change or replace battery. |
| No AC output from generator. | Check main line circuit breaker. Check circuit breaker & fuses. Transfer switch set to NORMAL position. Generator internal failure. Thermal circuit breaker open. | 1. Reset to ON or CLOSED. 2. Reset and replace, if necessary. 3. Set to GENERATOR position. 4. * 5. Auto-reset - Wait 5 min. and attempt restart. |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.