Sensor readings look wrong

If a sensor reading looks suspect, work through this list before assuming hardware failure.

All sensors on a cable read the same value

Almost always a wiring issue. Power-cycle Chester X1 (toggle the switch off, wait 10 seconds, on). If readings stay stuck, the connector at the top of the cable is likely loose or corroded. Disconnect, inspect for moisture or bent pins, and reseat.

One sensor reads −40 °C or +85 °C

These are the rail values for the sensor IC. They mean the sensor has lost communication with the cable. Usually a single cracked solder joint inside the cable, often from being pulled during unloading. The cable will need to be replaced.

All readings are 5–10 °C high

If the cable is pressed against the bin wall, sun-warmed steel will dominate the readings. Re-suspend the cable so it hangs freely in the centre of the grain mass, at least 30 cm from the wall.

Humidity reads 100 %

A humidity sensor that has been condensed on (water droplets on the sensor element) will report 100 % until the element fully dries. This can take up to 48 hours. If readings still report 100 % after a week of dry weather, the sensor element is contaminated and the cable should be replaced.

Temperature is correct but humidity is missing

Some older sensor cables only have temperature sensors. Check the cable spec. If it is supposed to have humidity, see all sensors on a cable read the same value above — typically a partial-disconnect symptom.