Moeller M1-800-MOELLER Error Codes: List of 14 Codes and Their Meaning

This is the list of fault codes the Moeller manual gives for the M1-800-MOELLER electronic overload relay. Find your code below and open it for what the manual says about its causes and what to do.

Fault codes from p. 8

Code	What it means	Page
`oc`	Tripped on Overcurrent	p. 8
`SP`	Tripped on current single phasing or unit won't start because the voltage is sing phased.	p. 9
`ub`	Tripped on current unbalance or unit won't start because the voltage is unbalanced.	p. 9
`uc`	Tripped on Undercurrent	p. 9
`CF`	Tripped on Contactor Failure	p. 9
`GnF`	Tripped on Ground Fault	p. 8
`Lo`	A low voltage condition exists.	p. 9
`rP`	Incoming phases have been reversed. Your motor may run backward if started.	p. 8
`oFF`	A stop command was issued from a remote source.	p. 8
`Ptc`	A high temperature has been measured by the Zem-I/O-NET.	p. 9
`P`	The voltage inputs are reverse phased	p. 9
`Hi`	The unit has not started	p. 9
`RUN`	The overload relay has tripped on the fault shown on the LED display and is timing down "RD3" before restarting.	p. 9
`GrF`	A ground fault current greater than the programmed "GF" value has been detected.	p. 9

Codes and descriptions are taken from the manufacturer’s manual; page numbers link to the PDF. ManualLib is not affiliated with Moeller. Found a mistake? Report an error.