Control panel displays Sn2 and spa may shut down heating or pumps

Safety first: Shut off power at the GFCI breaker before removing panels or touching wiring.

What Sn2 means: On many Dream Maker Spas using Balboa/Gecko packs, Sn2 indicates a problem with the high-limit sensor that protects against overheating.

• Reset power: Turn the breaker OFF for 2–3 minutes, then ON. If Sn2 clears and does not return, monitor the spa for normal operation.
• Inspect high-limit sensor: Remove the access panel and locate the heater tube. The high-limit sensor is usually clipped or threaded into the heater housing. Check that it is firmly seated and not hanging loose.
• Check wiring and connector: Trace the high-limit sensor cable back to the control pack. Unplug and re-plug the connector labeled HI-LIMIT or SENSOR 2. Look for corrosion, moisture, or burnt pins.
• Test the sensor (if equipped to do so): With power OFF and sensor unplugged, measure resistance across the sensor leads. Compare to the expected thermistor chart for your pack. An open circuit or wildly off value indicates a bad sensor.
• Replace the high-limit sensor: If faulty, install a compatible Dream Maker/Balboa/Gecko high-limit sensor. Ensure the o-ring is in place and the sensor is properly seated against the heater tube for accurate temperature sensing.
• If Sn2 returns immediately: The control board’s high-limit circuit may be defective. Do not bypass the high-limit sensor. Contact a spa technician to test and replace the control pack if needed.