Why is the GFEP light flashing on my APS-4C?

This indicates that there is a ground fault on one of the attached SC-40C satellite controllers. The SC-40C that has the ground fault will have a solid red GFEP light and will not allow the heaters to be powered. Isolating the heater leg that has the ground fault is...

What is the EMC light for?

EMC stands for Energy Management Computer, which can be used to remotely monitor and control the APS-C series ice melt controllers. These connections are made to the Class 2 connection terminal block on pins 14 through 22.  The following diagram will aid in making...

High Temperature Limit dial not turning unit on?

Why doesn’t adjusting the High Temperature Limit dial turn the unit on? The High Temperature limit dial is used to set the maximum temperature that the unit will work at. When the High Temperature limit sensor detects a temperature higher than what is selected on the...