Ariston Cut-Out Thermostat Indirect 935185

The Ariston 935185 is a cut-out thermostat of the indirect type, used as a safety limit device on Ariston gas boilers and indirect hot water appliances. It monitors temperature at the indirect sensing point and interrupts the burner circuit if the set limit is exceeded. It is a service part for the Ariston appliance families listed below.

• The appliance locks out or shuts down and will not run after a reset attempt.
• The burner cuts out before the appliance reaches its normal operating temperature.
• Repeated lockouts during a single heating cycle, with no other fault indicated.
• No hot water production from the indirect cylinder while the programmer is calling.
• The cut-out device shows signs of scorching, a loose sensing capillary, or damaged terminals.

• Confirm the appliance model and serial number against the fitment list, as coverage varies by build range.
• Check the part number on the existing thermostat matches 935185.
• Confirm the appliance requires the indirect type cut-out thermostat, not the direct equivalent.
• Verify the fault is the cut-out thermostat and not the control thermostat, sensor or wiring.