Ariston 65115140 Wired Thermostat

The Ariston wired thermostat 65115140 is a temperature-sensing control component used in Ariston water heating appliances, including the Andris Lux 15L and the 3 kW EU variant. It monitors the temperature of the stored water and switches the heating circuit on and off to hold the appliance at the selected set point. Because it is a wired unit, it connects directly into the appliance's control circuit rather than communicating remotely, making it a straightforward swap for an engineer working on the heater. It sits within the thermostats, thermistors and sensors group of Ariston and Chaffoteaux spares.

• Water stays cold or only reaches lukewarm even though the appliance is powered and calling for heat
• Stored water temperature drifts away from the setting, or swings between hot and cold
• The heater cuts out before reaching the set temperature, or runs on past it
• The safety cut-out trips repeatedly and needs resetting
• No change in water temperature when the control is adjusted

• Check the appliance rating plate to confirm the model and variant, particularly the Andris Lux 15L and 3 kW EU versions
• Match the number on the existing thermostat against 65115140 before ordering
• Cross-reference the alternative number 1593275 when checking older documentation or supplier listings
• Inspect the thermostat pocket and any sealing washer on removal, as these are often disturbed during replacement