E13 error and water is hard immediately after installation or resin replacement
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: No internal electrical work is needed. If adjusting plumbing, close valves and relieve pressure first.
Step-by-step:
- Check bypass: Confirm the AquaUnique bypass is fully in SERVICE position. A partially open bypass can mix hard and soft water.
- Verify tank size: In the installer menu, ensure the correct tank size and resin volume are selected for your model.
- Perform full regeneration: Manually start a complete regeneration cycle, including backwash, brine draw, and rinse, to fully condition the new resin bed.
- Retest hardness: After regeneration, run water for several minutes and test softened water hardness. E13 should clear if configuration is correct.
When to call a technician: If hardness remains high and E13 persists, the resin may be improperly installed or the distributor tube may be damaged, requiring professional inspection.