Michael Phelps Spas
Heater Element Failure
Spa will not heat; water stays cold even though pumps run and set temperature is high
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or burned-out heater element, Tripped high-limit or thermal fuse on heater, Loose heater wires at control pack, Corroded heater terminals
How to Fix / Troubleshooting
Safety: Turn OFF power at the GFCI breaker and verify no voltage is present.
- Confirm demand for heat: Set the temperature several degrees above current water temperature and ensure the heater indicator icon appears on the topside.
- Inspect heater connections: Open the equipment bay and locate the stainless steel heater tube attached to the control pack. Check that both heater wires are securely fastened to the heater terminals and the board.
- Check for visible damage: Look for burn marks, melted insulation, or corrosion at the heater terminals.
- Test heater element (with meter): Disconnect heater wires and measure resistance across the heater terminals. Typical values are 8–15 ohms depending on wattage. Infinite resistance indicates an open element.
- Replace heater assembly if failed: Drain the spa below heater level, loosen heater unions, disconnect wiring, and remove the heater. Install a new OEM Michael Phelps/ Master Spas-compatible heater assembly, reconnect unions and wiring, then refill and bleed air.
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Repair Difficulty
Hard
4/5
Required Part
Heater Assembly (Stainless Steel Tube with Element)
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