Cummins/Onan GSAA engine Engine Engine

• Voltage Sense Lost - Fault Code 27 27
• VOLTAGE SENSE LOST 27
  Cause: Control unable to sense output voltage
  Fix: Have unit serviced by an authorized Cummins Onan dealer.
• Undervoltage - Fault Code 13 13
• Underfrequency - Fault Code 15 15
• STARTING BATTERY RUNS DOWN
  Cause: Marginal battery connections, battery, charging system, excessive cranking
  Fix: 1. Clean and tighten positive (+) and negative (−) battery cable connections at the battery. 2. Recharge or replace battery. Refer to the battery manufacturer’s recommendations. 3. Have battery charger serviced by an authorized Cummins location.
• STARTER ENGAGES − DISENGAGES
  Cause: Cranking voltage dips below 6 VDC − Battery connections, battery, charging system, start/stop switches
  Fix: 1. Clean and tighten positive (+) and negative (−) battery cable connections at the battery. 2. Recharge or replace battery. Refer to the battery manufacturer’s recommendations. 3. Have the battery charger serviced by an authorized Cummins Onan dealer.
• Speed Sense Fault - Fault Code 45 45
• SPEED SENSE FAULT 45
  Cause: Controller unable to sense quadrature frequency.
  Fix: Have unit serviced by an authorized Cummins Onan dealer.
• Processor Fault - Fault Code 43 43
• Overvoltage - Fault Code 12 12
• Overfrequency - Fault Code 14 14
• NO RESPONSE − STATUS INDICATOR LIGHT DEAD
  Cause: Low/No battery voltage, poor battery connection, faulty battery, open harness connection, faulty start/stop switch, faulty LED
  Fix: 1. Try generator set Start Switch if the remote display Start Switch does not respond, and vice versa 2. Clean and tighten positive (+) and negative (−) battery cable connections at the battery. 3. Recharge or replace battery. Refer to the battery manufacturer’s recommendations.
• NO AC POWER − GENERATOR SET RUNNING, STATUS LED ON STEADY OR FLASHING RAPIDLY
  Cause: Circuit breakers tripped to OFF, due to short circuit or overloading.
  Fix: 1. Reset or turn on generator set circuit breaker. 2. Reset or turn on circuit breaker in the distribution panel. 3. Reduce number of loads. 4. Have the circuits from the generator set and distribution panel verified by an authorized electrician.
• No AC Power - generator set Running, Status LED On Steady or Flashing 2
• Low Cranking Speed Sense - Fault Code 32 32

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan GSAA engine.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.