Booster heater over-heats; water flashes to steam at rinse nozzles.
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: Shut off power to the booster and allow it to cool completely. Risk of scalding is high.
Step-by-step checks:
- Measure booster outlet temperature: Use a thermometer to confirm actual temperature.
- Inspect thermostat/probe: Check for secure mounting and scale buildup. Replace if readings are inaccurate or intermittent.
- Check contactor: Inspect the booster contactor for welded contacts. Replace if stuck closed.
- Verify high-limit: Ensure the high-limit thermostat trips at its rated temperature and is not bypassed.
When to call a technician: Booster overheating should be corrected by a technician familiar with CMA booster systems.
Repair Difficulty
Required Part
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