Common Causes for Refrigerators Not Cooling Properly

[Downaski]

Hello everyone,

I’m curious about the common reasons why refrigerators, especially models like Whirlpool or GE, might stop cooling properly. I’ve heard that issues like blocked vents, faulty thermostats, or dirty coils can contribute to this problem.

What are the best troubleshooting steps to take when a refrigerator is not maintaining the correct temperature? Any advice on how to diagnose the issue would be greatly appreciated!

Thank you!

[machinist]

HI Downaski!

Let's dive into the nitty-gritty of refrigerator cooling issues, focusing on models like Whirlpool and GE.

When a fridge isn't maintaining proper temperature, we're usually looking at one of several key systems failing: the sealed system (compressor, evaporator, condenser), the air distribution system, or the control system. Let's break it down.

First, the sealed system. If you're dealing with a compressor issue, listen for the telltale click-hum when it tries to start. A failed start relay or overload protector can prevent the compressor from running. You can test the start relay with a multimeter - if it's not showing continuity between the run and start terminals when shaken, it's toast. Low refrigerant charge can mimic compressor problems, but you'll need a set of manifold gauges to confirm this. Look for signs of oil residue around joints or fittings, which could indicate a slow leak.

For the air distribution system, start with the evaporator fan. If it's not running, you'll get poor cooling in the fridge compartment even if the freezer's fine. These motors often fail gradually, so listen for unusual noises before they quit entirely. The condenser fan is crucial too - if it's not running, the compressor will overheat and shut off on thermal overload.

Don't overlook the defrost system. A failed defrost heater or defrost thermostat can lead to a frost-caked evaporator, killing airflow and cooling efficiency. You can ohm out the defrost heater to check for continuity, and test the defrost thermostat for proper cycling.

Control system issues are trickier. Modern fridges use thermistors for temperature sensing - a faulty thermistor can throw off the whole cooling cycle. You can check these with a multimeter too, looking for resistance changes as you vary the temperature. Main control boards can also fail, usually in sections, leading to erratic cooling behavior.

When troubleshooting, always start with the basics - door gaskets, airflow obstructions, condenser coil cleanliness - before diving into component-level diagnostics. And remember, while many issues are DIY-fixable, anything involving the sealed system usually requires professional intervention due to EPA regulations on refrigerant handling.

Let me know if you want to explore any specific component or system in more detail. Thank you!