How do I know if my refrigerator compressor is bad?

Common signs include both compartments warming up, the compressor clicking every few minutes without starting, or the compressor running constantly with little cooling. But fans, relays, defrost failures and control or inverter boards can cause the same symptoms, so a technician should test before replacing the compressor.

Is my refrigerator compressor under warranty?

Many manufacturers cover the sealed system or compressor longer than the standard one-year warranty, sometimes for parts only. Check your warranty documents or the manufacturer's site with your model and serial number.

Why is my refrigerator compressor hot?

Compressors normally run warm. Excessive heat can result from a dirty condenser, a failed condenser fan, poor airflow around the refrigerator or a very hot room, all of which make the compressor work harder.

Can I replace a refrigerator compressor myself?

No. Compressor replacement involves recovering refrigerant, brazing, evacuating and recharging a sealed system. Federal EPA rules require refrigerant work to be done by trained technicians with proper equipment.

Refrigerator Compressor Failure: Repair or Replace?

"The compressor is gone" is one of the most worrying things a refrigerator owner can hear. It sounds like the end of the appliance, and sometimes it is. But the compressor is also one of the most misdiagnosed parts in a refrigerator. Several smaller components produce the same symptoms. This guide explains how to tell the difference and how to make the repair-or-replace decision if the compressor really has failed.

What the Compressor Does

The compressor is the pump of the refrigeration system. It compresses refrigerant vapor and pushes it through the condenser, where heat is released, and then through the evaporator, where the refrigerant absorbs heat from inside the cabinet. Older refrigerators use single-speed compressors that switch on and off. Many newer models use variable-speed inverter or linear compressors controlled by an electronic inverter board, which run more quietly and efficiently.

Symptoms of Compressor Trouble

Both the freezer and fresh-food sections warming up.
Clicking every few minutes from the back, with the compressor not starting.
The compressor running constantly with weak cooling.
Unusually loud humming, knocking or buzzing from the compressor area.
A breaker or GFCI tripping when the compressor tries to start.

What the Sounds Can Tell You

A healthy compressor makes a steady, low hum when it runs. Inverter compressors may speed up and slow down, which changes the pitch, and that's normal. A click followed by a few seconds of buzzing and then another click, repeating every few minutes, is the classic sign that the compressor is trying and failing to start. Complete silence from the compressor area while the cabinet warms points toward the control, the relay, the inverter board or the power supply rather than the compressor itself. Write down what you hear, or record a short clip, before you call.

Parts That Mimic a Failed Compressor

Start relay and overload

On conventional compressors, a small relay and overload protector clip onto the compressor terminals. A failed relay produces the classic click-every-few-minutes symptom. It's a modest part.

Inverter board

On inverter-driven compressors, the board that powers the compressor can fail, especially after power surges. Without testing, an inverter board failure looks just like a dead compressor.

Condenser fan

If the fan that cools the condenser stops, the compressor overheats and shuts off on its overload, then tries again. The result looks like an intermittent compressor problem.

Dirty condenser

Dust-coated coils make the compressor run longer and hotter. In Las Vegas, fine dust builds up quickly, and summer heat in kitchens, and especially in garages, makes the effect worse. Cleaning the coils is one of the best things you can do for compressor life.

Defrost failure

If the evaporator coil ices over, air can't circulate, and the refrigerator warms up even though the compressor runs normally. Frost on the freezer's back panel is a clue.

Evaporator fan

A failed fan inside the freezer stops cold air from reaching the cabinet.

Control board or thermistor

If the control never calls for cooling, the compressor never starts.

Safe Checks Before You Call

Confirm power at the outlet and check the breaker.
Check the settings and make sure the unit isn't in demo or showroom mode.
Listen for the compressor hum and for the condenser and evaporator fans.
Clean the condenser coils with the refrigerator unplugged.
Check clearance around the refrigerator. Built-in units need their front grille clear; freestanding units need some space at the back and top as specified in the manual.
Look for frost on the freezer's back panel.
Note the age and find the model and serial numbers.

What Compressor Replacement Involves

If testing confirms the compressor has failed, replacement is a sealed-system repair:

Recover the remaining refrigerant with approved equipment.
Remove the old compressor and braze in the new one.
Replace the filter-drier.
Pressure-test for leaks and evacuate the system with a vacuum pump.
Recharge with the correct type and weight of refrigerant.
Verify cooling performance.

It takes time, skill and equipment, and federal EPA rules restrict refrigerant handling to trained technicians. That's why it's one of the bigger repairs on a refrigerator.

Repair or Replace?

Factors that favor compressor repair:

Warranty coverage. Many brands cover the compressor or sealed system for longer than the standard warranty, sometimes for parts only. LG and Samsung, for example, have offered extended compressor coverage on some models. Check yours before deciding.
Age. A refrigerator in the first half of its roughly 10- to 15-year service life is a better candidate.
Built-in or high-end units. Replacing a built-in refrigerator often involves cabinetry, so repair is more attractive.
Otherwise good condition. Good seals, working ice maker, no cabinet damage.

Factors that favor replacement:

An older refrigerator with no warranty coverage.
Other major problems at the same time, such as a leaking evaporator or a failing control board.
Parts that are no longer available.

What to Expect After a Compressor Replacement

After a sealed-system repair, the refrigerator needs time to pull down to temperature, often several hours to most of a day, depending on how warm it got. Keep perishables in a cooler until an appliance thermometer shows about 40°F or below in the fresh-food section and 0°F or below in the freezer.

A new compressor may sound different from the old one, especially if your refrigerator now has a replacement model with a different design. Normal sounds include a low hum, refrigerant gurgling or hissing as the system balances, and clicks as the control cycles. Loud knocking, rattling or a compressor that runs without cooling after a full day are worth a call to whoever did the repair, since a compressor replacement should be covered by the repair warranty.

Protecting the Compressor

Clean the condenser coils regularly.
Keep the clearances specified in the manual.
Avoid placing a refrigerator in a hot garage unless it's rated for those temperatures. Our guide to garage freezers in Las Vegas heat explains climate classes.
Protect against surges, which can damage inverter boards.

Getting a Diagnosis

Our refrigerator repair service tests the relay, overload, fans, inverter board and compressor windings before recommending a compressor replacement. We work on all major brands and use genuine OEM parts when available. Same-day appointments are available when booked early, and repairs carry our 90-day parts and 30-day labor warranty.