Alpha Thermostat 100 Deg C Klixon 1.025797

The Alpha 1.025797 is a Klixon thermostat rated at 100°C, used as a temperature-sensing and cut-out device within Alpha's Intec and Eco boiler ranges. It sits in the boiler's control circuit and opens or closes according to the temperature it senses, protecting the appliance from overheating and helping regulate the heating cycle. Klixon thermostats of this type are a serviceable item and are replaced as a complete unit.

• The boiler locks out or shuts down once it has been running for a period, particularly after the appliance has reached temperature.
• Heating or hot water stops before the boiler reaches its normal operating temperature.
• The appliance cycles on and off more frequently than usual, or fails to restart after cooling.
• A fault code or lockout condition appears that points to an overheat or temperature-sensing fault.
• The thermostat shows visible signs of heat damage, a distorted body or a loose or corroded connection.

• Confirm the GC number of the appliance against the compatibility list, as several Intec and Eco variants use different thermostat ratings.
• Check the model and serial plate on the boiler, including whether the unit is the LPG version, before matching the part.
• Compare the alternative numbers 1258389 and 025797 against any markings on the thermostat being removed.
• Work on the boiler should be carried out by a competent person, with the appliance isolated and made safe before any component is disturbed.