Lochinvar & A.O. Smith 100167769 Integrated 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 ...

During routine boiler servicing, visually check the board for burnt spots, loose plugs, or oxidation on terminals. Make sure the enclosure stays dry and free from condensation buildup. Confirm all sensor harnesses remain firmly locked in place to avoid erratic boiler cycling or unexpected shutdowns.

• Sudden loss of display or no power to board.
• Fault codes triggered by sensor miscommunication.
• Relay sticking leading to continuous operation.
• Startup failure after voltage fluctuation.
• Random resets during heating cycles.