ACV
Overtemperature at Outlet
Water temperature too hot at taps, risk of scalding
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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 ACV DHW sensor reading too low, Stuck or failed thermostatic mixing valve, Incorrectly set DHW setpoint, Bypassed or bridged safety thermostat
How to Fix / Troubleshooting
Safety: High water temperature can cause severe burns. Warn occupants and reduce temperature immediately.
- 1. Lower setpoint: Reduce the DHW temperature setpoint on the ACV controller to a safe level (e.g., 50–55°C at the tank, with mixing valve set appropriately).
- 2. Check mixing valve: Adjust the thermostatic mixing valve to a lower setting. If outlet temperature does not change, replace the valve.
- 3. Sensor verification: Compare displayed tank temperature with an external thermometer. If the display is much lower than actual, replace the DHW sensor.
- 4. Inspect safety devices: Ensure no one has bypassed the safety thermostat or other limit devices. Restore proper wiring if tampering is found.
If overheating persists, shut down the heater and have an ACV technician inspect the control system.
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Repair Difficulty
Medium
3/5
Required Part
Thermostatic Mixing Valve / DHW Sensor
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