Originally Posted by jimjenturner
Most Thermisters as the temperature raises the resistance goes down and when temperature lowers the resistance raises. That being said since you are reading 32° my guess is there is loose connection or a wire that is making and breaking connection.
While trying to track down the issue the mobile tech using his ohm meter and checking the thermistor resistance found that the resistance in the thermistor wires were correct for the inside temp of the coach indicating the thermistor was sending the correct temp, but what the silver leaf was reading was 32 degrees. He then check the AC circuit board and found what appeared to be some arcing and a loose wire and so replaced the board and it came up and showed the correct temp and begun cooling, I check again in about an hour or so and the air compressor had drop out and the fan was blowing and ssilverleaf temp showed 32 degrees.
I did call silverleaf to discuss with them and they said that in 2018 to 2020 or 2021 Newmar installed a battery bridge solenoid on all coaches made with a White Rogers and it did not have a diode and that before replacing anything I should first replace it with a Amtec #140045 or install a diode as it has cause some issues silverleaf control boxes and to eliminate current or future problems.so I have one to install next week.
I went out last week to check the coach and the temp was showing 69 so I tried the AC again and as soon as it was turn on I watched the temp count down to 32 degrees again. The 32 degrees seems to be a constant in all of this so in disparation I will have the tech check the freeze temp sensor.