Moeller M1-800-MOELLER Error ub: Tripped on current unbalance or unit won't start because the voltage is unbalanced.

Electronic overload relay · taken from the manufacturer’s manual, pages cited

Fault codeub

The unit tripped from current unbalance or failed to start due to unbalanced voltage. The manual's first action is: “Display alternates "SP", "ub", or "Lo" with the "DISPLAY / PROGRAM" switch parameter value.”

Model
Moeller M1-800-MOELLER
Display shows
ub
Type
Fault code
Source
Manual p. 8

What ub means

Tripped on current unbalance or unit won't start because the voltage is unbalanced. p. 9

Common causes

  • The unit has not started. p. 9

What to do

  1. Display alternates "SP", "ub", or "Lo" with the "DISPLAY / PROGRAM" switch parameter value. p. 9

If ub is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact Moeller service.

Open the manual at page 8 All M1-800-MOELLER error codes Manual details & download

This page summarises what the manufacturer’s manual says about ub; 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 Moeller. Found a mistake? Report an error.