441
UnclassifiedCooling
What This Code Means
Unbalanced AC output; Coolant Sensor OOR (Out of Range) warning; Low Battery warning
Possible Causes
- •Improper load distribution
- •Incorrect output lead configuration
- •Loose or damaged voltage sense leads
- •Faulty exciter stator resistance
- •Damaged wire harness
- •Loose or damaged wire harness connections, control, or PMG
- •Incorrect field voltage
- •Faulty main stator resistance
- •Faulty coolant sensor connections
- •Faulty coolant sensor
- •Faulty harness or base board
- •Weak or discharged battery
- •Loose or dirty battery connections
- •Wrong battery voltage
Suggested Actions
- 1Check load distribution
- 2Check output lead configuration
- 3Check that voltage sense leads are secure and in good condition
- 4Check exciter stator resistance
- 5Check wire harness condition
- 6Check wire harness connections, control, and PMG
- 7Check field voltage
- 8Check main stator resistance
- 9Check coolant sensor connections
- 10Check coolant sensor
- 11Check harness / base board
- 12Reset control and restart
- 13Recharge or replace battery
- 14Rectify or clean battery connections
- 15Check for wrong battery voltage
ASK RUDY ABOUT THIS FAULT
Get a diagnosis walkthrough for 441 on your specific Onan unit — cited to the OEM manual, not a forum guess.
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