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Series S0700 Troubleshooting Trouble Cause Measures . Replace the valve. . Purify the air source. (Refer to the 3/4/5 Port Solenoid Valves Precautions 5 on page 7.) 2) Pressure drop The pressure of the air source decreases and fails to reach the minimum operating pressure of the valve, resulting in operating failure. Adjust the pressure of the valve within the operating pressure range. 1) Electric system error . Sequencer failure . Incorrect wiring . Open fuse and lead wire disconnection . Voltage drop Check each item and take applicable measure. 1) Voltage drop The product may not operate due to a voltage drop even when its indicator light remains illuminated. Check the voltage and take applicable measure if decreased. 2) Current leakage The product does not shift from off to on due to the residual voltage. Check the residual voltage, which shall be 2% or less of rated voltage. 3) Pilot valve failure . Foreign matter from the air source has entered the inside of the pilot valve and has caused operating failure. . Open coil circuit 1) Current leakage The response of the product was delayed due to the residual voltage. Check the residual voltage, which should be 2% or less of the rated voltage. 2) Clogging of the filter element of the manifold . Clean or replace the element. 3) Foreign matter from the air source has entered the main valve and has caused slide failure and sticking. . Replace the valve. . Purify the air source. (Refer to the 3/4/5 Port Solenoid Valves Precautions 5 on page 7.) Operating failure The air supply direction has not been changed. Response failure The product operates, but has a time delay. . Replace the pilot valve assembly.