E17
State
Recirculation Pump Control Error (internal or external pump models)
State tankless water heater displays E17; unit may not recognize recirculation demand.
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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 internal recirculation pump, Incorrect pump wiring, Faulty pump relay on control board
How to Fix / Troubleshooting
Safety: Disconnect power and close isolation valves before working on the pump.
- Listen for pump: During a recirculation call, listen for the internal pump running. If silent, proceed with checks.
- Check wiring: Inspect the pump power connector and harness. Reseat connectors.
- Voltage test: A qualified technician can measure voltage at the pump terminals during a recirculation call. If voltage is present but the pump does not run, replace the pump. If no voltage, suspect the control board or settings.
- Verify programming: Ensure recirculation mode is enabled and scheduled correctly in the control menu.
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Repair Difficulty
Hard
4/5
Required Part
Internal Recirculation Pump
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