Ariston
DHW Control Misconfiguration
Thermostat does not control domestic hot water recirculation pump or cylinder as expected, even though configured.
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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
Wrong system type selected (combi vs system), DHW relay wired incorrectly, Cylinder sensor not installed or detected, DHW schedule disabled
How to Fix / Troubleshooting
Safety: Isolate power to pumps and boiler before wiring checks.
- Confirm system type: In installer settings, select the correct boiler/cylinder configuration.
- Verify wiring: Ensure the thermostat’s DHW output is wired to the correct pump or valve, and that any cylinder sensor is connected to the right NTC terminals.
- Enable DHW schedule: Check that DHW schedules are active and not overridden by holiday or eco modes.
- Test manually: Use the thermostat’s manual DHW boost function to see if the pump or boiler responds; if not, suspect wiring or output faults.
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Repair Difficulty
Hard
4/5
Required Part
Ariston DHW Control Relay / Output
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