NIBE Accessory Card 718338 

The NIBE Accessory Card 718338 is an electronic control board (PCB) used in many NIBE heat pump accessories and ventilation modules. It enables communication and control between the main heat pump unit and add‑on modules such as cooling units, pool heating modules, ventilation recovery units, and more.

Key Specs 
•     Type: Electronic accessory/control PCB
•     Weight: 0.4 kg
•     Dimensions: 154 × 215 × 55 mm
•     PCBASW Accessory board
•     SIT Display byte Emmy ML

Compatible NIBE Models
According to product listings, this accessory card works with a wide range of NIBE modules, including:
Ventilation & Recovery:
•     ERS 10, ERS 20, ERS 30, ERS S10
•     SAM 40
Cooling Modules:
•     HPAC 40, HPAC S40
•     PCM 40, PCM 42
Pool Heating:
•     POOL 40, POOL 500
Accessory Controllers:
•     AXC 30, AXC 40
•     ECS 40, ECS 41

Other Modules:
•     PVT 40, DEH 40, DEH 310, DEG 41, DEW 40, SOLAR 41, PCS 44, SMO 05

When You Need This Part
You may need the 718338 accessory card if you experience:
•     Loss of communication with an accessory module
•     Module not powering up
•     Error codes related to accessory control boards
•     Upgrading or adding modules (e.g., pool heating, cooling, ventilation)
If you describe your symptoms or the module you're working with, I can help you confirm whether this is the correct part.