Condition normally indicates an overcharged system. Slowly remove refrigerant through low side service port until gauge readings are normal or until proper cooling returns.

Low Pressure Gauge is High and High Pressure Gauge is Low

Condition normally indicates faulty reed valves in compressor when this condition is accompanied by extremely vibrating gauge needle. Compressor service is required.

Low Pressure Gauge is Low and High Pressure Gauge is Low

Condition normally indicates low refrigerant charge. Add refrigerant until gauge readings are normal or proper cooling returns.

Low Pressure Gauge is Low and High Pressure Gauge is High

Condition normally indicates blockage in air condition system. Service is required.