Nibe
Nibe Connection Card 818643
Nibe Connection Card 818643
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Description
The Nibe Connection Card (Part Number: 818643) is a signal routing and power interface PCB located inside the compressor housing of select Nibe exhaust air heat pumps.
It serves as the main wiring terminal hub, coordinating live feedback between critical refrigeration sensors, safety switches, and the central CPU.
Specifications & Managed Components
| Feature | Details |
| Part Number (SKU) | 818643 |
| Location | Compressor / refrigeration module section |
| Routing & Functions |
• Compressor power/control signals • Exhaust fan control connection • Temperature sensors (BT16, BT20, BT21) • High Pressure (HP) & Low Pressure (LP) safety switches |
Compatible Nibe Models
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Nibe F370 Exhaust Air Heat Pump
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Nibe F372 Exhaust Air Heat Pump
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Nibe F730 Exhaust Air Heat Pump (select configurations)
Common Failure Symptoms
When card 818643 fails (often caused by electrical surges or local terminal overheating), the unit typically displays one of the following fault patterns:
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Persistent High Pressure (HP) or Low Pressure (LP) alarm codes despite normal refrigeration pressures.
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Invalid, missing, or flickering temperature readings for sensors BT16, BT20, or BT21.
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Loss of power/signal to the extraction fan or compressor starter.
To verify a successful installation: re-energize the unit and check service menu 3.1 (service info). Verify that all temperature sensor channels display live numerical values rather than dashes or default error states, and confirm that active HP/LP alarms have cleared.
