Ariston Thermostat NEXT EVO X 65153815

The Ariston 65153815 is a thermostat manufactured for the NEXT EVO X series of gas boilers. It sits within the appliance's temperature sensing circuit, monitoring heat levels and passing that information to the boiler control so burner output and domestic hot water delivery are regulated correctly. It is a serviceable component, so it is replaced when temperature readings drift or the boiler stops responding to demand.

• The boiler fails to respond to a call for heat or hot water even though the controls are set correctly
• Temperature at the tap or radiator runs noticeably hotter or cooler than the setting on the boiler
• The appliance cycles on and off more frequently than normal, or short-cycles during a demand
• The burner cuts out before the set temperature is reached, or continues running past it
• Fault codes relating to temperature sensing or overheating appear on the boiler display

• Confirm the boiler model and serial number against the utilization cases listed above before ordering
• Check the part number on the existing thermostat matches 65153815, as the same appliance family can use more than one thermostat variant
• Note the alternative number 1593302 when cross-referencing against older documentation or stock records
• Work on the boiler casing and internal components should be carried out by a competent person, with the appliance isolated and made safe first