dY
Michael Phelps Spas
Persistent Dry Heater Lockout
Display shows dY or DY after a dr condition; spa will not heat
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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 heater condition not resolved, Severe airlock in heater, Failed circulation pump, Severely restricted plumbing or closed valves
How to Fix / Troubleshooting
Safety: Turn OFF power at the GFCI breaker.
- Resolve underlying dr issues first: Ensure water level is correct, filters are clean, and all slice valves are fully open.
- Bleed system thoroughly: Loosen heater and pump unions to purge all trapped air. You may need to repeat this several times.
- Inspect circulation pump: Confirm that the circ pump impeller spins freely and that the motor is not seized. Replace the pump if it is not operating.
- Reset the control pack: After correcting flow issues, leave power OFF for at least 5 minutes to allow the control to reset the dY lockout. Then restore power.
- Monitor operation: Watch the display for any reoccurrence of dr or dY. If dY returns, the heater or control board may be damaged from previous dry firing and should be evaluated by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Circulation Pump or Heater Assembly
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