Vaillant Temperature Limiter 101384

The Vaillant 101384 is a temperature limiter used in Vaillant Thermocompact fanned flue gas boilers. It forms part of the boiler's temperature control and safety circuit, cutting the appliance out if the sensed temperature exceeds its set limit. It is listed under thermostats within gas boiler spares.

• The boiler locks out or shuts down before reaching its normal operating temperature.
• The appliance will not fire, or fires only briefly before cutting out.
• Repeated resetting is needed to keep the boiler running.
• The limiter shows signs of heat damage, scorching or a loose or corroded connection.
• Fault codes or lockout behaviour consistent with an overheat trip.

• Confirm the boiler model against the fitment list above.
• Check the existing limiter's part number and connections match 101384.
• Isolate the electrical supply and verify the fault is with the limiter rather than the thermostat or sensor circuit.
• Check that the boiler has not tripped for a separate reason, such as poor circulation or a blocked heat exchanger.