Lennox 81L76 Control Board C2-3

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 ...

Regularly inspect the board for dust, debris, or signs of corrosion. Ensure all wiring connections are secure and check for burnt components. Proper maintenance prevents operational errors and reduces the risk of electrical hazards. Always disconnect power before inspection.

• Faulty or loose wiring connections.
• Overheated or damaged circuitry.
• Erratic control signals.
• Failure to communicate with other system components.