A refrigerator that isn’t cooling is almost always one of nine things: a dirty condenser coil, a failed condenser fan, a bad evaporator fan, a faulty start relay, a worn door seal, a broken thermostat, low refrigerant from a leak, a frozen evaporator coil, or a failing compressor. The light turning on when you open the door means the unit has power — the problem is almost never electrical at that point, it’s mechanical or refrigeration-related.
Here’s how to work through each cause, starting with the ones you can check yourself.
1. Dirty or Blocked Condenser Coils
The condenser coils — usually located behind or underneath the fridge — release heat from the refrigerant as it cycles. When they’re coated in dust, pet hair, or grease, the fridge can’t dump heat efficiently, and internal temperatures climb even though the compressor is running constantly.
Check it: Pull the fridge out, locate the coils, and look for a visible layer of dust or buildup. Fix: Vacuum or brush the coils clean. This alone resolves a large share of “not cooling” calls, especially in homes with pets.
2. Condenser Fan Not Running
The condenser fan pulls air across those coils. If it’s obstructed by debris or the motor has failed, heat builds up around the compressor and cooling drops off.
Check it: With the fridge unplugged and pulled out, spin the fan blade by hand — it should move freely with no grinding or resistance. Fix: Clear obstructions, or the motor needs replacement if it doesn’t spin freely or makes noise when powered.
3. Evaporator Fan Failure
Located inside the freezer compartment, this fan circulates cold air from the evaporator coils into both the freezer and, through vents, the fridge section. If it fails, the freezer may still stay cold while the fridge section warms up — a classic symptom pattern.
Check it: Open the freezer and listen for airflow noise when the compressor is running. Silence usually means the fan has stopped. Fix: Fan motor replacement — this isn’t usually a DIY-safe repair since it involves accessing sealed compartments.
4. Faulty Start Relay or Capacitor
The start relay gives the compressor the initial jolt of power it needs to start running. A failed relay means the compressor hums but never kicks in, or doesn’t run at all.
Check it: Listen near the back of the fridge — a repeated clicking or humming sound (without the compressor actually starting) points to relay failure. Fix: Relay replacement is inexpensive but requires correctly identifying the part for your compressor model.
5. Worn or Damaged Door Seals (Gaskets)
If the rubber gasket around the door is cracked, warped, or not sealing tightly, warm air continuously leaks in, forcing the compressor to run overtime without ever reaching the target temperature.
Check it: Close the door on a piece of paper — if you can pull the paper out without resistance, the seal isn’t tight enough. Fix: Gasket replacement, which is a straightforward and affordable repair.
6. Thermostat Malfunction
The thermostat (temperature control) tells the compressor when to run. If it’s stuck or miscalibrated, the compressor may not activate even though the fridge is warm.
Check it: Turn the dial from the coldest to warmest setting — you should hear the compressor click on or off. No response suggests thermostat failure. Fix: Thermostat replacement.
7. Frozen Evaporator Coil
A malfunctioning defrost system (defrost heater, timer, or thermostat) can allow frost to build up on the evaporator coil until it’s completely blocked, cutting off cold airflow entirely.
Check it: This requires removing the back interior panel of the freezer — not always accessible without tools. A telltale sign is a fridge that cools fine for a while, then gradually warms over 24–48 hours. Fix: Defrost system repair. This is a common failure point and one of the more frequent reasons we get called out in Prince George, especially on fridges over 6 years old.
8. Low Refrigerant (Leak)
If refrigerant has leaked from the sealed system, the fridge loses its ability to remove heat altogether. This is different from every cause above — it’s not something a part swap fixes without also locating and sealing the leak.
Check it: You can’t reliably diagnose this yourself. Signs include the compressor running constantly with no meaningful temperature drop, or a hissing sound near the back panel. Fix: This requires a licensed technician with refrigerant handling certification — it’s not a DIY or general-handyman repair in Canada.
9. Compressor Failure
The compressor is the heart of the cooling system. If it’s failed outright, nothing above will fix the problem.
Check it: Feel the compressor (the black, rounded unit at the back-bottom) — if it’s not warm/vibrating at all after the fridge has been running, it may be dead. Fix: Compressor replacement is the most expensive refrigerator repair, and at this point it’s worth comparing the repair cost against the price of a new unit — see our refrigerator repair cost guide for typical pricing.
DIY-Safe vs. Call-a-Technician
| Symptom check | DIY-safe? |
|---|---|
| Dirty condenser coils | Yes |
| Door seal test | Yes |
| Thermostat dial test | Yes |
| Condenser/evaporator fan issues | Caution — accessible but easy to damage other parts |
| Frozen evaporator coil / defrost system | No — requires disassembly |
| Refrigerant leak | No — requires certification |
| Compressor | No |
A Note for Prince George Homes
Fridges in Prince George work harder in winter than most people expect — not because of outdoor temperature, but because many homes keep kitchens warmer to compensate for cold snaps, which increases the temperature differential the compressor has to fight. We also see more condenser coil buildup here in homes with forced-air heating, since dust circulates more in dry winter air.
Frequently Asked Questions
Why is my fridge not cold but the freezer is fine?
This points to the evaporator fan, a blocked air vent between compartments, or early-stage evaporator coil frosting — not the compressor.
Why is my freezer not cold but the fridge is fine?
Less common, but usually a defrost system fault has frozen the evaporator coil enough to block airflow to the freezer specifically.
Can a refrigerator be low on Freon and still run?
Yes — the compressor will keep running (often constantly) trying to compensate, but cooling will be weak or absent.
Is it worth repairing a refrigerator that’s not cooling?
Usually yes if the fridge is under 8–10 years old and the issue isn’t the compressor or a refrigerant leak. Coil cleaning, fan replacement, gasket, and thermostat repairs are all cost-effective compared to replacement.
If you’ve checked the coils and seals and it’s still not cooling, it’s time to bring in a technician before food loss adds up. Book a refrigerator repair in Prince George and we’ll diagnose it on the first visit.