Ideal Sensor Assembly ST9 Super 013755

The Ideal 013755 is a sensor assembly supplied under the ST9 Super designation. It is a sensor-type component that sits within the appliance's control and monitoring circuit, feeding temperature information back to the boiler so that firing and modulation stay within the intended range. It is produced for Ideal commercial Concord Super Series appliances and is listed as a thermostats, thermistors and sensors spare.

• The boiler locks out or shuts down shortly after ignition with no obvious fuel or ignition fault.
• Temperature readings on the display drift from the actual flow or return temperature, or read implausibly high or low.
• The appliance short-cycles, firing and stopping more often than the demand requires.
• Fault codes relating to temperature sensing or sensor circuit resistance appear on the controls.
• Output becomes erratic or the boiler fails to modulate smoothly once it reaches temperature.

• Confirm the GC number on the appliance data badge matches 41-415-68 or 41-415-69 before ordering.
• Check the part number 013755 against the existing sensor and the appliance documentation, as the ST9 Super assembly is used across several Concord Super variants.
• Isolate the electrical supply and allow the appliance to cool before removing the old sensor.
• Have a suitable seal or gasket to hand if the sensor is being fitted into a wet pocket, so the joint can be remade correctly.