Error codeE4
Communication error happens due to power supply +24 VDC OFF, controller button ▲ / ▼ / S button OFF, or a communication issue. The manual's first action is: “Turn the power off and on again”
- Model
- SMC IZT40, IZT41/42 series
- Display shows
- Communication error (E4)
- Type
- Error code
- Source
- Manual p. 40
What E4 means
Communication error p. 59
Common causes
- Power supply +24 VDC OFF p. 59
- Controller button ▲ / ▼ / S button OFF p. 59
- Communication error p. 59
- When communication failure occurs due to noise or disconnection, etc. p. 59
- Communication error (applicable models: IZT40, IZT41, IZT42). When abnormality occurs in the communication between the controller and high voltage power supply module due to electrical noise or disconnection. p. 59
What to do
- Turn the power off and on again p. 59
- The abnormal signal is OFF (ON when normal. IZTC40 does not have an output signal), and the ION/HV LED of CH with abnormality is flashing (red) and the error code "E4" is flashing in the frequency display. p. 59
If E4 is still not resolved
The manual gives no further instruction for this code. Open the code table in the PDF or contact SMC service.
This page summarises what the manufacturer’s manual says about E4; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with SMC. Found a mistake? Report an error.