A10
Wolf
DHW Temperature Sensor Fault
Boiler displays A10, domestic hot water (DHW) not available or temperature incorrect
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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 DHW NTC sensor on plate heat exchanger or cylinder, Wiring fault between DHW sensor and PCB, Sensor not properly inserted into pocket, Scale build-up affecting sensor response
How to Fix / Troubleshooting
Safety: Isolate electrical power and allow hot water components to cool before touching.
- Check DHW settings: Ensure the DHW temperature setpoint on the Wolf controller is correct and that DHW mode is enabled.
- Reset the boiler: Perform a reset to clear any transient sensor error.
- Visual inspection (competent person): Locate the DHW NTC on the plate heat exchanger or cylinder. Check that it is fully inserted and the cable is intact.
- Call a technician: If A10 remains, a professional should test the NTC resistance, descale the plate heat exchanger if necessary, and replace the sensor.
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Repair Difficulty
Medium
3/5
Required Part
DHW Temperature Sensor (NTC)
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