Service manual

9. Troubleshooting 9-2013
b. If misalignment is toward the bearing, the cause is not from this tolerance issue and is
likely the result of the end bell not being seated properly during assembly. Inspect for
cause and repair as necessary.
9.17 Overfrequency - Fault Code 14
Logic: Instantaneous Fault - Frequency greater than 72Hz Delayed Fault - Frequency greater
than 66Hz, but less than 72Hz, for 6 continuous seconds
NOTICE
This fault code is for both the 50 Hz and 60 Hz models.
Possible Causes: Generator set loads, engine governor function, fuel supply, air fuel mixture,
exhaust system, choke, demand regulator, carburetor, generator windings, wire connections
Diagnosis & Repair:
1. Verify that the Last Fault is FC 14: Yes, continue diagnosis; No, troubleshoot actual last
fault.
2. Measure AC current while running the generator set with loads: identify faulty or short
cycling loads.
3. Measure generator set load capability with load bank (de-rate for altitude and temperature
as necessary).
4. Measure AC frequency while running.
5. Measure AC frequency while changing engine rpm to determine if frequency response
matches engine rpm response.
6. Disconnect the generator set control J1 connector, verify the J1 pins are fully inserted, and
inspect pin condition using the steps below:
• Use the test points of the tester tool #420-0603
• Use mating pin connector, a pin gauge of the same size (.045") as the mating control
connector pin, or any suitable device that will not damage the inside contact wipers of
the pin socket
• Insert, repair, or replace pins as necessary.
7. Reconnect J1 connector and test run the generator set for fault occurrence: repair or
replace pins in the connector as necessary.
8. Check all grounds and neutral leads for looseness at the battery and the generator set; run
the generator set on a separate battery: tighten or replace terminals and leads as
necessary.
9. Check for air filter cleanliness; replace air filter as necessary.
10. Check for blocked or damaged exhaust system: repair or replace exhaust components as
necessary.
11. Propane Models
a. When ambient temperatures are less than 40°F vapor – withdrawal Propane tanks
should be at least half full to provide proper vaporization rate.
94 A030A239 (Issue 10)