Lochinvar & A.O. Smith 100208458 Interface Control Board

Thermostatic expansion valves are an integral part of your refrigeration unit. They are responsible for ensuring the right dosage of refrigerant is entering the cooling coil to ensure maximum efficiency in the air conditioning of the system.    These special expansion valves come with a temperature sensor that is mounted at the end of the evaporator coil. They incorporate signals from this sensor to maintain the required temperature of the HVAC system. The thermostatic expansion valve works like a precision device that can regulate the measurements of the liquid refrigerant that flows into the evaporator of your system. This regulation in the flow of the refrigerant is essential to prevent the reverse flow of the refrigerant into the compressor of your system.    Through this mechanism, the thermostatic expansion valve successfully separates the high and low pressure sides of the refrigeration/air conditioning system. The liquid refrigerant enters the expansion ...

Inspect the interface control board regularly for loose connections, corrosion, moisture intrusion, or signs of overheating. Keep the control compartment clean and free of dust that could affect electrical performance. Verify wiring integrity and diagnostic indicators during routine equipment service. Always disconnect power before inspecting or servicing the board.

• Failure to communicate with connected system components.
• Unresponsive control interface or display functions.
• Intermittent equipment operation or unexpected shutdowns.
• Error codes related to control board communication faults.
• Power distribution failures to connected controls.
• Incorrect system status readings or monitoring issues.
• Corrosion on terminals causing unstable system behavior.