Below is the detailed C-frame press malfunctions and solutions, it not only list where is the failure, but also the reasons why it happened and the solutions.
| Category | Faults | Reasons | Solutions |
| Main motor | Ac Contactor not work, main motor not work | 1. clutch bond | Check the switch to，adjusting microinching position Check the power supply |
| 2. power failure | |||
| 3. control circuit failure | |||
| 4. thermo relay work | |||
| 5. winding turnoff | |||
| Ac Contactor work, main motor not work | 1. main motor line broken | Repair | |
| 2. main motor fault | Repair | ||
| 3. poor contact | Repair | ||
| 4. main motor bearing fault | Repair | ||
| Main motor not stop | 1. stop button short out | Repair | |
| 2. two contacts colliquefaction | Repair | ||
| 3. contactor movable part fault | Repair | ||
| Operation | Sliding block not move | 1. auto stop button not restoration | Restoration |
| 2. sliding block not back to the top dead center | Sliding block back to top dead center | ||
| 3. pressure relay not work | Adjusting air pressure | ||
| 4. overload protector microswitch not adjusted | Readjusting | ||
| 5. power source or power fault | Repair | ||
| 6. auto stop button bad contact | Repair | ||
| 7. operating button contact | Repair | ||
| 8. clutch cylinder stroke increase | Change adjusting shim | ||
| 9. clutch get stuck or air leakage | Repair | ||
| 10. clutch magnetic valve air leakage or coil short | Repair | ||
| Sliding block stops at the bottom dead center | 1. auto stop button processing circuit due to vibration | Increase spring force | |
| 2. ac contactor off due to vibration | Change antivibration switch | ||
| 3. overload protection microswitch off due to vibration | |||
| 4. cam controller switch not work | |||
| Sliding block cannot stop at the top dead center | 1. clutch stroke increase | Change adjustable pad | |
| 2. cam adjustment fault | Readjustment | ||
| Stop position not regularly | 1. relay contact fusion | Change contactor | |
| 2. relay residual magnetism | Change relay | ||
| 3. button spring damage | Change button | ||
| 4. damage fault | Repair | ||
| 5. clutch emit heat | Reduce operation time | ||
| 6. spring force too low | Increase spring force or change | ||
| Emergency stop button cannot restoration | Button not good | Change | |
| Coil melting loss. melting loss | 1. excess temperature | Adjusting | |
| 2. supply voltage exceed specified value | |||
| 3. generate residual magnetism | |||
| 4. lead too tight | |||
| Movable iron core cannot go back when power off | 1. movable iron core Slipper part get stuck | Wipe off impurity | |
| 2. reset spring corrosion | Change spring | ||
| Actuation time error | 1. iron core and valve seat corrosion | Iron core rust removal or change, increase | |
| 2. Slipper part has dust and impurity | Voltage | ||
| Reversing valve | Leakage | 1. P-A cavitary seal ring broken | Replace sealing element part |
| 2. priority valve and main valve coupling screw loose | |||
| After reverse, O cavitary Continue to vent | 1. P-A cavitary seal ring broken | Replace sealing element part, change seal ring | |
| 2. piston seal broken | |||
| Not reversing | 1. coil bad contact | Check binding post | |
| 2. coil burning-out | change coil | ||
| 3. main valve element get stuck | Removing impurities | ||
| 4. valve slipper part large resistance | Improve lubrication | ||
| 5. poor lubrication | Change seal ring | ||
| 6. seal ring deformation | Change seal ring | ||
| Valve vibration | 1. control air supply low pressure | Increase control pressure | |
| 2. guide solenoid valve low voltage | Increase supply voltage | ||
| Reversing valve | Reversing too slow | exhaust resistance increasing due to silencer installed at the vent | Change silencer |
| Balance valve fault | 1. two guide solenoid valve electrical signal out of sync | Check electrical signal | |
| 2. travel switch not work | Check valve element dynamical friction switch, change them if necessary |
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