After the power, display E1, to determine the sensor circuit problems, dismantling and found that one foot of the relay was blown off, replace the bad relay, and then power, show E4, to determine the pressure switch failure, I as a maintenance beginner, Once encountered such a failure, how to determine the pressure switch is good or bad, how maintenance?
Pressure switch bad contact, remove the touch Cengceng on the line.
Look at the instructions to determine that you device
Measured with a multimeter
With a multimeter resistance file pressure is set to 0, the sensor resistance is about 100 kilohms. If this measurement is this value, then the circuit board has a problem, check whether the circuit was blown, plug the card is bad.
