If you suspect your refrigerator is running too long and you cannot directly observe the inside, there are a few signs you can look out for:
Temperature Fluctuation: If the temperature in the fridge or freezer seems inconsistent, or if food is not as cold as it should be, the fridge might be running too long in an effort to maintain the correct temperature.
Increased Electricity Bill: If your electricity bill is higher than normal and you can't identify any other cause, your refrigerator might be running longer than it should be, consuming more electricity.
Excessive Heat: The area behind and around the refrigerator should be slightly warmer than the rest of the room, but if it is hot to the touch, it might indicate that the refrigerator is working harder than it should be.
Noise: Most refrigerators make a low humming noise when they're running, which should stop once the desired temperature is reached. If this noise continues for an extended period of time without stopping, it may indicate the fridge is running too long.
Frost Build-up: If your fridge or freezer is not frost-free and you notice excessive frost build-up, it may be a sign that the fridge is running too long or that the door seal is not working properly.
Condensation: If you notice excessive condensation on the outside of the fridge or around the seal, it may indicate that the fridge is having trouble maintaining its internal temperature and is running more than it should be.
If you observe any of these signs, it's a good idea to get the refrigerator checked out by a professional. It could be a problem with the thermostat, the cooling system, or the door seals, among other things.