Safety first: Turn off power before opening the control panel.

Steps to address SWO error:

Inspect keypad surface: Look for cracks, bubbling, or water under the membrane overlay. Replace if damaged.
Check ribbon cable: Open the control panel and locate the flat ribbon cable from the keypad to the control board. Reseat the connector and ensure it is fully inserted.
Dry moisture: If moisture is present, gently dry the area with a soft cloth and allow time for complete drying before re‑energizing.
Test operation: Restore power and test buttons. If SWO persists, the keypad or control board may need replacement.

Note: Always use Raypak‑approved replacement keypads to maintain proper sealing and fit.

Display shows 'SWO' and heater will not respond to keypad inputs.

Possible Causes