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CSL Part Number: 85438
Product Overview: The ONAN 300-5030 is a generator control board used in Quiet Diesel generator sets, particularly 7500-watt models. It manages the complete start sequence including preheat cycle, glow plug operation, starter motor engagement, and monitors parameters like oil pressure and temperature. The board interfaces with external switches, sensors, and output drivers to control generator operation and provide fault code diagnostics. It features conformal coating for environmental protection and operates on 12VDC power from the generator battery system.
Category: Control Board
Manufacturer: ONAN
Manufacturer Synonyms: Cummins
Manufacturer Part Number: 300-5030
Also Known As(AKA): 332-3570A
Please include wiring diagrams or manuals if you have them.
Common Failures
This product may experience issues such as failure to start, overcurrent shutdowns, overvoltage errors, and physical damage to components like capacitors. Customers have also reported symptoms such as brief starter solenoid activation without the generator cranking despite power being present at the starter.
Repair Approach
Our repair process involves diagnostic testing of individual components using specialized equipment. Repair tasks may include replacing damaged capacitors, correcting reversed connections, and verifying that fuses are intact. In some cases, excessive damage or corrosion may render a unit Beyond Economic Repair.
Testing & Quality
Following repairs, units undergo testing to verify proper function. This may include power-up tests and component-level checks. Some units may be returned without repair if No Fault is Detected during testing, or if the extent of damage is determined to be Beyond Economic Repair after evaluation.
Limited Repair
The ONAN part number is only available as a limited repair at our facility. Repairs to this item may be limited due to several reasons:
- Availability of parts
- Less than 100% test ability due to required support equipment
To have us attempt a repair on your ONAN part follow these steps:
Step 1 -
Click the Repair Now button above to add the part and complete the RMA form.
Step 2 -
Print the RMA form that is sent to your email, and put it in the box with the parts for repair.
Step 3 -
Mail the box to the address on the RMA.
After we receive your item, we will perform an inspection and an authorization to repair will be sent for your approval. Work will begin after your authorization is received.
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