Spa will not heat; water stays at or near ambient temperature even though pumps run.

Safety first: Turn off power at the breaker and verify with a meter before touching heater terminals.

• Check for error codes: Even if none are obvious, scroll through the Everlast topside menu for hidden heater-related codes.
• Inspect heater wiring: Remove the control pack cover and verify that heater wires are tight and not discolored or melted.
• Continuity test: Disconnect heater leads and measure resistance across the Everlast heater element. An open circuit indicates a failed element that must be replaced.
• Relay test: With power ON and a heat call present, a technician can test for voltage at the heater terminals. If no voltage is present but relays click, the control board may be faulty.
• Replace heater assembly: Install a compatible Everlast Spas heater assembly, ensuring all unions are sealed and wiring is correct.