If but no forward movement and other movements, it shows that the compression pump is normal, just corresponding to the membrane touch switch fault or is corresponding with the electromagnetic valve failure. There are two ways to judge whether the electromagnetic valve is good or bad. One is to use the three meter measuring resistance, the other with a metal to see there is no suction. Of course, if the solenoid sucking action is normal. And the oil circuit blocking will also occur the above problems. If not just no forward movement, no other action, that is compressed pump fault the. First check the compression pump voltage has no, three table compression pump resistance normally do? If the aforementioned are normal is the commutation capacitor failure.

2016.6.29