Moisture can cause deterioration. The printed circuit board (PCB) may begin to deteriorate through corrosion. This is especially problematic for cheap PCBs. Further deterioration can occur in transistors, which may begin to fall apart and may not last as long.
Changes in Resistance
The exposed circuit tracings in the presence of moisture may change resistance. This can affect timing, reference frequencies, current levels, and reduction of sensor sensitivity. Essentially, the overall performance of the control board will suffer, and it may become inaccurate and unpredictable.
Mold can grow if the temperature is warm and humidity is present. Mold can corrode metal and etch the glass on a control board. Again, overall performance can suffer and longevity of the control board will lessen.
Effects of Contamination Worsened
The presence of humidity increases the negative effects of other contaminants. When combined with humidity, contaminants such as bodily fluid, fruit juice, other beverages, salt, or salt and vinegar together can cause a variety of problems. They include corrosion, the growth of fungus, short circuits and the growth of chemical crystals.