Nibe Low Pressure Switch - 718137

The NIBE Low Pressure Switch (Part No. 718137) is a safety component used primarily in classic NIBE Fighter series ground-source heat pumps. Key Technical Specifications Operating Pressure Range: 0.8 to 1.5 Bar Function: Monitors low-side refrigerant pressure. If pressure drops below 0.8 bar (often due to a refrigerant leak, extremely low source temperature, or a fan/brine flow failure), it cuts power to the compressor to prevent mechanical burnout or freezing damage. Primary Model Compatibility Used in NIBE’s commercial and high-capacity ground source heat pumps, most notably: NIBE F1345 Series (e.g., F1345-24 kW / F1345-30 kW and related commercial variants) You typically need to replace or test this component if: The heat pump’s display shows a persistent Low Pressure Alarm / Defrost Fault even when refrigerant charge and brine/air flow are completely normal. The internal microswitch has failed open, preventing the controller from starting the compressor.