USSPA
No Heat Condition
Spa powers on but will not heat; temperature remains below setpoint despite long run times.
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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
Failed heater element in USSPA heater tube, Tripped high-limit or dry-fire protection, Faulty heater relay on control board, Flow issues preventing heater from engaging
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker before opening the control box or touching heater wiring.
- Confirm settings:
- Verify set temperature is higher than current water temperature.
- Ensure spa is not in Economy or Sleep mode.
- Check for flow-related errors:
- Look for FLO, DR, or DRY codes; resolve any flow issues first (clean filters, bleed air, check pumps).
- Inspect heater connections:
- Open equipment bay and check heater terminals for tightness and signs of burning.
- Test heater element:
- With power OFF and heater wires disconnected, measure resistance across heater terminals.
- OL (open) or near 0 Ω indicates a failed element; replace the heater assembly.
- Check heater relay:
- With power ON and a call for heat, verify (with a meter, if qualified) that voltage is present at heater terminals.
- If no voltage despite a heat call, the relay or control board is likely faulty and should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Heater Assembly
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