Display shows dY or DY1; spa indicates low current draw from heater or heater not detected.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Turn off power at the main breaker. Heater circuits carry lethal voltage; testing should be done by qualified personnel.
- Visual inspection: Open the equipment bay and inspect the heater terminals for burned wires or loose connections. Tighten if needed with power OFF.
- Continuity test: Disconnect heater leads and measure resistance across the heater element with a multimeter. An open circuit indicates a failed heater that must be replaced.
- Check wiring configuration: Ensure jumpers or dip switches on the control pack are set correctly for your heater size and supply voltage.
If the heater tests good but dY persists, the control pack’s heater relay or current sensor may be faulty and require replacement.
Repair Difficulty
Required Part
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