Ideal Overheat Thermostat Central Heating 172512

The Ideal overheat thermostat 172512 is a safety temperature sensor fitted to Ideal central heating boilers. It monitors the temperature at its sensing point and interrupts the burner sequence when that temperature rises beyond the designed limit, protecting the appliance and the system from overheating. It is part of the Ideal Europa boiler family and is listed under the spare part group Thermostats, Thermistors & Sensors.

• The boiler locks out or shuts down during a demand for heating or hot water and will not restart without a reset.
• The overheat cut-out trips repeatedly, even when the system appears to be running normally.
• The appliance reaches temperature and then cuts out earlier than expected, with the flow pipe running hotter than usual.
• Fault codes or lockout indications linked to an overheat condition appear on the boiler controls.
• The thermostat shows signs of heat damage, a loose connection or an open circuit when tested with a meter.

• Confirm the boiler model and GC number against the compatibility list, as the same part number is used across several Europa variants.
• Check the existing thermostat and its wiring before ordering, so the correct sensor type is matched to the appliance.
• Note the alternative number 1178858 when cross-referencing against older documentation or stock records.
• Work on the boiler casing and controls should be carried out by a competent person, with the appliance isolated and made safe first.