Spa powers on but will not start heating when HEAT button is pressed

Safety first: Unplug the spa before any internal inspection; do not bypass safety devices.

• 1. Verify settings:
  • Check the set temperature and raise it above current water temperature.
  • Ensure filtration is running; some models require circulation for heating.
• 2. Check cover and environment:
  • Fit the insulated cover to reduce heat loss.
  • Avoid operating in very cold ambient temperatures.
• 3. Listen for heater relay:
  • When enabling heat, listen for a click from the heater pump unit.
• If no heat and no relay click: The heater relay or PCB may be faulty. If relay clicks but water does not warm, the heater element may be open. Professional testing and replacement of the heater assembly is recommended.