Fault 14

Onan Generator: “Fault 14”

warning RV generator fault codes

Safety Combustion engine - if you smell gasoline or propane, stop and ventilate before doing anything. Let hot parts cool; never operate in an enclosed space (carbon monoxide).

What it means

Overfrequency fault. The engine governor could not hold the rated output frequency and the engine ran too fast (output frequency too high). Read as one blink, a pause, then four blinks.

Most likely causes

Engine governor unable to maintain rated speed/frequency common
Governor actuator or controller fault common
Fuel-delivery irregularity (e.g., on LPG, oil migration affecting fueling) less common

Safe checks you can do yourself

Note when it occurs (idle vs. load).
Do not adjust the governor yourself - the manual directs this to a dealer.

How to reset / clear Fault 14

Official corrective action: see an authorized Onan dealer.
Re-read the stored code by pressing Stop three times within 5 seconds (code stops blinking after ~5 minutes).

When to call a technician

The manufacturer lists 'see an authorized Onan dealer' for code 14 - governor/frequency faults are not a DIY fix.

Applies to

Onan RV QG / KY series RV gensets · Onan blink-code-controller RV gensets

FAQ

What does Onan Generator code "Fault 14" mean?

Overfrequency fault. The engine governor could not hold the rated output frequency and the engine ran too fast (output frequency too high). Read as one blink, a pause, then four blinks.

How do I reset Onan Generator Fault 14?

Official corrective action: see an authorized Onan dealer. Re-read the stored code by pressing Stop three times within 5 seconds (code stops blinking after ~5 minutes).

What is the most common cause of Fault 14 on a Onan Generator?

The most likely cause is engine governor unable to maintain rated speed/frequency.

Related · Onan generator

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Low oil pressure fault (a first-level fault shown as two bli… Fault 3
First-level 'service check' fault. Three blinks tell you the… Fault 12
Overvoltage fault. The controller could not keep the output … Fault 13
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Underfrequency fault. The engine governor could not keep the… Fault 19
Governor actuator fault. The controller detected an open or …

Sources

Onan RV Generator Troubleshooting Codes (Table 5) — TABLE 5 - OVERFREQUENCY FAULT-CODE NO. 14 (Engine governor unable to maintain rated frequency) (Cummins/Onan (hosted by Heartland Owners))

Note: Note the contrast: code 15 is UNDERfrequency (too slow), which can sometimes be eased by reducing connected load; code 14 (overfrequency) is directed to a dealer.

● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.