Er-4 Thermal Trip

Problem: The heater thermal trip has activated.


Low water level, airlock in pipework, closed jet faces, dirty or clogged filter cartridge, pump has failed or operation intermittent.


  • Ensure water level is correct – Refer to manual for further information on required fill levels
  • Check all jet faces are in the on position.
  • Remove filter cartridge and clean as per manufacturer’s recommendations, or replace if required.
  • Ensure waterfall is open to allow for any trapped air to escape
  • Contact you spa pool supplier if the problem persists.
  • Turn mains power off and restart spa

If the problem persists, contact RotoSpa for further support.