bD
Hayward
Bypass or External Control Error
Display shows bD; heater will not fire when controlled by external automation.
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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
Incorrect wiring to remote/automation terminals, Misconfigured control mode, Faulty external control board, Open remote enable circuit
How to Fix / Troubleshooting
Safety First: Turn off power before accessing the wiring compartment.
- Check control mode: On the Hayward heater interface, verify whether it is set to "Stand Alone" or "Remote" as appropriate for your installation.
- Inspect remote wiring: Open the wiring compartment and check the low-voltage connections to the remote/automation terminals. Tighten any loose wires.
- Test in stand-alone mode: Temporarily set the heater to local control and set a temperature above water temperature. If it fires normally, the issue is with the external control system.
- Verify automation settings: On the pool automation panel (e.g., Hayward OmniLogic/ProLogic), ensure the heater is enabled and assigned correctly.
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Repair Difficulty
Medium
3/5
Required Part
Remote Control Interface
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