Ideal HIU Solenoid Actuator 178077

The Ideal 178077 is a solenoid actuator supplied for Ideal Commercial heat interface units (HIUs). It is the electrically driven component that responds to a control signal and moves the valve it is mounted on, allowing the unit to open or close flow as demand changes. As a serviceable item on the HIU, it is replaced as a complete actuator rather than repaired.

• The HIU does not respond to a call for heat or hot water, with the valve staying in its resting position.
• The actuator body is warm, buzzing or humming continuously when no demand is present.
• The valve position does not change even though the control signal is present at the actuator.
• Intermittent operation, where the valve opens or closes only after repeated demand cycles.
• Visible damage, burning or a loose or corroded plug connection at the actuator head.

• Confirm the appliance model and, where shown on the data badge, the GC number against the compatibility list.
• Check the actuator fitted to the unit carries 178077 or the alternative number 1783170 before ordering.
• Isolate the electrical supply to the HIU before removing or refitting the actuator.
• Inspect the valve body and any seal or O-ring at the mounting point while the actuator is off, and renew if worn.