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. |
| FuelSys006 | Fuel System Fault |
| 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. | 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 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; 7. Replace Switch |
| 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.