Troubleshooting Automatic Shutdown Conditions - Generac Power Systems MAGNUM MTT15 Operating Manual

disconnect models, measure across the junction box terminals when the light is unplugged. On hard
wired models, remove the mast junction box cover and insert the wire probes into the connector blocks
for the light and ground. If proper voltage is not achieved, perform capacitor check to determine if the
capacitor or coil needs to be replaced.

TROUBLESHOOTING AUTOMATIC SHUTDOWN CONDITIONS

Allow engine to cool before performing any troubleshooting procedures. Contacting
LOW OIL PRESSURE SHUTDOWN
1. Check the level of the engine oil with the dipstick. The engine controller will shut the engine down when
the oil pressure is less than 20 psi (138 kPa). Add oil if required.
2. Visually inspect the engine for oil leaks.
3. If the oil level is good, restart the unit and verify the loss of oil pressure. Shut the engine down immediately
if the oil pressure value does not read 5 psi (34 kPa) within five seconds.
4. Check the oil pressure sender. To identify corrective action, refer to the troubleshooting section of the
engine operator's manual provided with the unit.
HIGH COOLANT TEMPERATURE SHUTDOWN
1. Check the coolant level in the overflow jug.
2. Restart the engine and read the coolant temperature to verify a high coolant temperature shutdown.
Stop the engine immediately if the coolant temperature is 230°F (110°C) or more.
3. ALLOW THE ENGINE TO COOL. Add coolant to the overflow jug if it is low and then check the level
of coolant in the radiator. To access the radiator cap, you must remove the access panel from the top
of the enclosure directly above the radiator. Add coolant until it is 3/4 in. (1.9 cm) below the filler neck.
Secure the radiator cap back and access panel into their original position.
4. Check the radiator shroud and ducting for blockage and remove any foreign matter.
5. Inspect coolant hoses, engine block and water pump for visible leaks.
6. Check the tension of the serpentine drive belt for the water pump.
7. If no other problems are found, remove the load on the generator and restart the engine. Check the
coolant temperature and shut the engine down immediately if it starts to overheat. For additional
information on engine overheating, refer to the engine operator's manual.
OVERCRANK SHUTDOWN
1. Check the fuel level in the tank.
2. Check for proper operation of the fuel pump.
3. Check the air filter for blockage.
4. If the engine will not start, refer to the engine operator's manual for additional information on trouble-
shooting starting problems.
OVERSPEED OR UNDERSPEED SHUTDOWN
1. Disconnect all loads and restart the unit. Read the frequency (Hz) on the LCD display. With no loads on
the generator, the frequency should read 60.0 Hz.
2. If the frequency is above or below 60.0 Hz, the engine speed will have to be adjusted. Refer to the engine
operator's manual for throttle adjustments on mechanical governed units and see the electronic governor
manual for electronically controlled units.
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WARNING
the engine when it is hot will cause personal injury.