Snow light on SC-40C stays on longer than APS-4C

The snow light stays on longer for the SC-40C than the APS-4C because the APS-4C gets its command from an actual snow sensor where the SC-40C’s get their command from the APS-4C. When the snow sensor’s moisture grid dries out, it no longer sends a snow present command...

Is a snow sensor required for a SC-40C?

No, the SC-40C does not use a snow sensor, it is completely controlled by the attached APS-4C. However, the SC-40C does require the High-Temperature sensor Thermistor to be connected (or bypassed with a 470K-ohm resistor) in order for the unit to operate. The SC-40C...

Temperature sensor was not installed

The high limit temperature sensor is intended for two purposes, either as a slab sensor when the APS-C series unit is used for heating sidewalks, patios or drives or for ambient air temperature when the unit is used for roof and gutter melt systems.In roof and gutter...

Can I simulate a sensor call for heat?

Yes, you can simulate a sensor call for heat to test the system by putting a jumper between pins 1 and 2 of the class two terminal blocks, the system will respond as if the sensor were seeing snow conditions. The snow and heat indicators will come on and relay or...

Why do I have a red GFEP light on?

The GFEP indicator will come on when a ground fault occurs in one of the heater circuits. The insulating resistance of the heater cable is breaking down or the cable has been damaged allowing current to pass to ground thru an incorrect pathway. Left un-repaired the...