21281780 Control Unit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta/QL electronic control board for specified 12- or 24-volt bow-thruster systems. It interprets helm commands and controls the thruster contactor/drive logic, protection functions and timing circuits.

⚙️ Key Features

• Genuine Volvo Penta/QL bow-thruster control unit
• Used in specified 12 V and 24 V QL thruster systems
• Processes helm control commands
• Supports protection and contactor logic
• Match system voltage, thruster model and connector revision
• Engine type: 12 V or 24 V electric bow-thruster system

🔌 Function

Receives operator commands and controls the electrical switching and protection functions that run the bow thruster.

⚠️ Common Signs of Failure

• Stored communication or control-unit fault codes
• Loss of the related control or protection function
• Intermittent faults caused by heat, vibration or moisture
• Corroded connector pins or water intrusion
• No communication, incorrect output or failed self-test

🛠️ Service Notes

• A replacement control unit normally has to be loaded with the software and parameter set for your engine and installation before it will run — that is authorised-dealer work with Volvo Penta's own diagnostic tool, so plan the job around it rather than around the fitting time
• Isolate the batteries at the main switches and leave the system dead before disconnecting or connecting anything; back-feeding a live bus through a half-mated connector is a common way to destroy a new unit
• Treat the unit as static-sensitive and mechanically delicate: handle it by its housing, leave it in its packaging until it is going on, and never weld on the boat with control units connected
• Mate connectors clean and dry and push them fully home until the lock engages, then refit the harness clips and any shielding so the loom is not left hanging on the plugs
• Mount it in its own bracket and original orientation so the cable entries face as designed and water runs away from the connectors rather than into them

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21281780 → Supersedes 41100658 → Supersedes 41100123

OEM / Related Numbers

• 41100658 earlier number superseded by this part
• 41100123 earlier number superseded by this part
• 41100896 - later 24 V control references used on specified systems
• 21369665 - later 24 V control references used on specified systems
• 41100915 - related 12 V control references; direct interchange requires thruster-model confirmation
• 41100889 - related 12 V control references; direct interchange requires thruster-model confirmation

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging