Display shows PS or PRESS SW error; Raypak unit will not start or shuts down shortly after starting.

Safety first: Turn off power and relieve water pressure before removing any pressure switch or plumbing components.

• Restore normal pressure: Clean or backwash the pool filter and ensure all valves are fully open. Check for obvious leaks on the suction side that could reduce pressure.
• Inspect heater unions: Make sure the inlet and outlet unions at the Raypak manifold are fully tightened and gaskets are intact, preventing air from entering.
• Check pressure switch tubing: Some Raypak models use a small tube from the manifold to the pressure switch. Inspect for kinks, cracks, or blockages and clear or replace as needed.
• Adjust or replace switch: If your model has an adjustable pressure switch, follow the Raypak manual to set it correctly (usually with a small screw). If adjustment does not help, replace the pressure switch.