Michael Phelps Spas Insufficient Heating Capacity or Heat Loss

Spa heats very slowly or cannot reach set temperature in cold weather

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.

Possible Causes

Partially failing heater element, Poor insulation or cover seal, Excessive filtration/pump run time adding cooling, Low supply voltage to heater

Check cover condition: Ensure the Michael Phelps Spas cover is in good condition, not waterlogged, and seals well around the edges.
Reduce heat loss: Limit use of air blower and open water features in cold weather, as they cool the water.
Verify heater output: Measure temperature rise over several hours. If very low, test heater element resistance and replace if out of spec.
Have voltage checked: An electrician can verify that the spa is receiving proper voltage at the control pack.

Medium 3/5

Heater Assembly and Spa Cover

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