Thermia
Thermia BM Circuit Card - 086L3946
Thermia BM Circuit Card - 086L3946
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Description
BM-CARD / Thermia Circuit Board
Part Number: 086L3946
Component: BM-CARD (Base/Main Control Board)
Brand: Thermia (a part of the Danfoss Group)
Function: Core logic/control board that manages the system’s operation, sensors, compressors, and user interface.
✅ Compatible with Thermia Models
| Thermia Model | Type |
|---|---|
| Thermia Diplomat Inverter Mini | Ground source heat pump (compact) |
| Thermia Diplomat Inverter L | Ground source heat pump (larger DHW capacity) |
These are inverter-driven ground source heat pumps known for efficiency and flexible output. The BM-CARD acts as the main controller.
⚙️ Key Responsibilities
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Manages all core functions of the heat pump
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Interfaces with sensors (temperature, flow, pressure)
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Controls compressors and circulation pumps
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Handles communication with the user display and possibly remote monitoring tools
🛠️ Common Use Cases
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Replacement due to fault or failure (system not starting, no display, irregular behavior)
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Upgrade during refurbishment or major servicing
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Necessary when resolving internal communication errors or corrupted firmware
