E13
Rheem
DC Bus Overvoltage in Variable‑Speed Drive
Pump intermittently shuts down with E13 indicating DC bus overvoltage on variable‑speed models.
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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
High incoming AC line voltage, Regenerative overvoltage from rapid deceleration, Failing DC bus capacitors in Rheem drive, Incorrect braking or ramp settings
How to Fix / Troubleshooting
Safety First: Only qualified personnel should service drive electronics. Turn OFF and lock out power, then wait several minutes for capacitors to discharge.
- Measure line voltage: With power ON and using a multimeter, verify that supply voltage is within Rheem's specified range. If consistently high, contact an electrician or utility.
- Adjust ramp settings: Access advanced settings and increase deceleration time so the pump slows down more gradually, reducing regenerative voltage spikes.
- Inspect DC bus capacitors: With power OFF and cover removed, look for bulged or leaking capacitors on the drive board. Replace the drive module if capacitors are damaged.
- Check for sudden load changes: Avoid rapidly closing valves or switching between high and low speeds abruptly. Program smoother transitions.
- Replace drive if needed: Persistent E13 with normal line voltage and proper settings indicates an internal drive fault; replace the Rheem motor/drive assembly.
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Repair Difficulty
Professional Required
5/5
Required Part
Rheem Variable-Speed Motor/Drive Assembly
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