Display shows Service or Call for Service; unit may continue to operate but with limited functions
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 immediate hazard is implied, but do not open the control housing while powered if you are not trained.
Step-by-step checks:
- 1. Review event history: Access the diagnostic or history menu on the Marlo controller to see any logged errors or abnormal conditions.
- 2. Check water quality: Test hardness at a faucet downstream of the softener. If hardness is high, the resin may be exhausted or regeneration may not be occurring properly.
- 3. Inspect salt and brine system: Verify salt level, brine draw, and refill operation during a manual regeneration.
- 4. Clear service reminder: If the Service message is purely time-based, follow the manual to reset the service interval after inspection.
When to replace parts: Depending on findings, you may need to replace the Marlo resin media, brine injector, or other components. If diagnostics indicate internal control failure, replace the Marlo control board.