12-14-2025, 02:48 PM
Adam,
The relay kills all power to the SCS units. The fans would not come on. I agree with Jeff, this is a thermostat issue.
But, I here ya. If you wanted to isolate the problem you could hot wire the yellow tstat wire to the SCS to 12V. The compressor should come on, and the outside fan. Don't run it that way for long because the inside fan will not be running which will cause the compressor thermal to trip.
Another reason I think it is likely a tstat issue is the inside fans get one signal from the tstat , and a SECOND and separate signal to start the compressors.
All that said, no two Newells are alike and we do not know what a previous owner may have done. There are Coleman Mach tstats that will replace the SCS ones if needed.
The relay kills all power to the SCS units. The fans would not come on. I agree with Jeff, this is a thermostat issue.
But, I here ya. If you wanted to isolate the problem you could hot wire the yellow tstat wire to the SCS to 12V. The compressor should come on, and the outside fan. Don't run it that way for long because the inside fan will not be running which will cause the compressor thermal to trip.
Another reason I think it is likely a tstat issue is the inside fans get one signal from the tstat , and a SECOND and separate signal to start the compressors.
All that said, no two Newells are alike and we do not know what a previous owner may have done. There are Coleman Mach tstats that will replace the SCS ones if needed.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home
)