Rheem
Unstable Speed Control / Feedback Issue
Pump speed fluctuates up and down without changes to settings; flow and pressure vary.
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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
Faulty tachometer feedback in Rheem variable‑speed motor, Loose speed control wiring, Electrical noise on control signals, Interference from external automation commands
How to Fix / Troubleshooting
Safety First: Turn OFF power before accessing internal wiring.
- Run in standalone mode: Disconnect external automation and run the pump using only the Rheem keypad at a fixed speed. If speed stabilizes, the issue is external.
- Inspect feedback wiring: Check the low‑voltage harness between motor and control for secure connections and damage.
- Reduce electrical noise: Route control cables away from high‑voltage lines and use shielded cable if recommended by Rheem.
- Replace motor/drive: If fluctuations persist in standalone mode, the internal speed sensor or drive is likely faulty and the motor/drive assembly should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Rheem Variable-Speed Motor/Drive Assembly
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