What should be checked if the thermostat in a refrigeration system fails?

When a thermostat in a refrigeration system fails, it is essential to check the power supply and wiring connections first. This is because the thermostat requires a proper power source to function, and faulty wiring or a lack of power can lead to a malfunction, causing the thermostat to appear as if it is not working.

Verifying the power supply ensures that the thermostat is receiving the electricity it needs to operate correctly. Additionally, checking the wiring connections for any loose or damaged wires is crucial, as these issues could interrupt the flow of electricity to the thermostat, resulting in operational failures.

While thermostat calibration is important, it typically comes into play after confirming that the thermostat is receiving power and that the wiring is intact. The refrigerant levels are generally not directly related to thermostat functionality, and compressor issues would likely manifest differently, suggesting that they are not the first areas to investigate in the case of a thermostat failure.