dY
Coast Spas
Persistent Dry Heater Lockout
Display shows dY or DY after a dr error; spa locks out heating until reset.
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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
Repeated dry-fire detection by control system, Severely restricted water flow through heater, Failed heater element causing abnormal current draw, Control pack firmware lockout after multiple dr events
How to Fix / Troubleshooting
Safety first: Turn off power at the GFCI breaker and allow the heater to cool.
- Resolve underlying dr cause: Follow the steps for the dr error to restore proper water level and flow.
- Inspect heater element: With power off and wires removed, test heater element resistance with a multimeter. Replace the heater assembly if open or shorted to ground.
- Reset spa: After correcting flow and heater issues, leave power off for at least 10 minutes to clear the dY lockout, then restore power.
- Monitor operation: Observe the spa through a full heat cycle to ensure dY does not return.
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Repair Difficulty
Hard
4/5
Required Part
Heater Assembly
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