The Murphy MPC-10 is a generator-set controller. It is used on generator sets from Generac, including the MIH400HC.
| Symptom | Cause | Remedy |
|---|---|---|
| Engine misfiring or runs irregularly | Poor fuel quality; incorrect/dirty fuel. | Test fuel, drain water from fuel bowl. Replace with proper fuel. Restricted fuel filter. Replace fuel filter element. Water, dirt, or air in fuel system. Drain, flush, fill, and purge fuel system. See the engine manual. |
| Engine will not crank | Low battery output voltage or discharged battery. | Charge or replace batteries. See Battery Installation and Replacement. Loose or corroded connections. Clean and tighten connections. Replace as necessary. Faulty start circuit relay. Contact a GMP ASD. |
| Excessive fuel consumption | Engine overloaded. | Reduce engine load. Restricted or dirty air cleaner. Replace air cleaner element as required. Insufficient compression. Determine cause of low compression and repair as required. Leaks in fuel supply system. Locate source of leak and repair as required. |
| Hard to start or will not start | Incorrect starting procedure. | Review starting procedure. See Before Starting Engine and Engine and Heater Startup. Restricted exhaust. Check and correct exhaust restriction. No fuel. Fuel valves closed, not allowing fuel to return or supply. Check fuel tank and replenish. Open fuel valves. Air in fuel line. Purge fuel lines. See engine manual. |
| Lack of engine power | Restricted air intake. | Service air cleaner. Restricted exhaust. Check and correct exhaust restriction. Poor fuel quality. Drain fuel and replace with proper grade and quality of fuel for operating condition. Restricted fuel filter. Replace fuel filter elements. |
| Starter cranks slowly | Low battery output voltage or discharged battery. | Charge or replace battery. See Battery Installation and Replacement. Excessive crankcase oil viscosity. Drain crankcase oil and replace with correct viscosity oil. See Draining and Refilling the Oil. Loose or corroded connections. Clean and tighten connections. Replace as necessary. |
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.