How to Fix a Fridge That’s Not Cooling Properly (Samsung, Bosch, LG)

If your fridge isn’t keeping things cold, don’t panic. Whether it’s lukewarm milk or soft ice cream, cooling issues are common—and often fixable without calling a technician. This guide walks you through simple checks and brand-specific fixes for Samsung, Bosch and LG fridges.

Understand the Basics

1. Power Supply

Make sure the fridge is plugged in securely. Test the socket with another device. If the fridge lights are off, check your fuse box for a tripped breaker.

2. Temperature Settings

Set the fridge between 2 °C and 4 °C, and the freezer to around −18 °C. Use a separate thermometer to verify actual temperatures.

3. Airflow & Ventilation

Do not block internal vents with food. Leave at least 5 cm of space around the back and sides. Avoid placing the fridge near heat sources such as ovens or in direct sunlight.

4. Door Seals

Inspect the rubber gasket for cracks or gaps. Clean the seal with warm soapy water. Replace it if damaged—leaky seals let cold air escape.

Samsung Fridge Not Cooling

1. Reset the Control Board

Unplug the fridge for 5 minutes, then plug it back in. Check for error codes or blinking lights once power is restored.

2. Exit Demo Mode

Demo mode disables cooling for showroom display. On Type A models you’ll see “OF FF” on the display. On Type B, a demo icon lights up. To exit, press and hold the Power Freeze and Freezer buttons simultaneously for 3 seconds.

3. Avoid Heat Sources

Samsung fridges struggle if placed next to ovens or sunny windows. If you cannot relocate it, lower the temperature setting by one or two degrees.

4. Inspect the Evaporator Coils

If you see frost build-up on the coils, airflow is blocked. Unplug the fridge, remove the rear freezer panel if accessible, and manually defrost or use a hairdryer on low heat. If frost returns quickly, the defrost system may need professional repair.

For more Samsung-specific tips, see Appliance Analysts’ guide.

Bosch Fridge Not Cooling

1. Power Cycle

Unplug the fridge for 5–10 minutes. Plug it back in and listen for the compressor to start.

2. Clean the Condenser Coils

Locate the coils at the back or underneath. Use a vacuum or a soft brush to remove dust. Dirty coils reduce cooling efficiency.

3. Check the Thermostat

Turn the temperature dial to a colder setting. If you hear no click, the thermostat may be faulty and require replacement.

4. Inspect the Evaporator Fan

Open the freezer and listen for the fan. If it is silent, it may be stuck or broken. Some Bosch models require removing the rear freezer panel to access the fan blade.

Refer to Bosch’s error-code guide at Bosch UK Support.

LG Fridge Not Cooling

1. Use Smart Diagnosis

Press the Smart Diagnosis button and follow the voice prompts. You can also scan via the LG ThinQ app for instant feedback.

2. Reset the Fridge

Unplug for 5 minutes, then plug back in and let it settle for at least half an hour before checking the temperature.

3. Check for Ice Build-Up

If frost is on the back wall, manually defrost. Persistent ice may point to a faulty defrost heater or sensor.

4. Test the Compressor

Listen for a humming sound. A silent compressor often means a fault. LG compressors are covered by extended warranty in many models—verify your coverage.

5. Clean the Air Filter

Some LG fridges have a replaceable air filter inside. Remove, clean or replace it every six months.

Further LG support is available at LG UK Support.

Advanced Troubleshooting (All Brands)

1. Test the Start Relay

Locate the start relay near the compressor. If it clicks or buzzes excessively, replace it with a compatible part (check your model number).

2. Check Temperature Sensors

Use a multimeter to measure resistance. A failing sensor can send incorrect temperature data to the control board.

3. Inspect the Defrost System

The defrost cycle involves a heater, timer and thermostat. Rapid frost build-up usually means one of these components is failing.

4. Review Error Codes

Modern fridges display codes when something is wrong. A quick web search of your model number plus the code often points to a precise fix.

When to Call a Technician

If you’ve tried all the above and the fridge still fails to cool, contact a qualified engineer. Signs you need professional help include a completely silent or overheating compressor, persistent error codes after resets, or any electrical faults such as sparks or tripping breakers.

Always use a manufacturer-authorised service centre to maintain your warranty.

Parts & Repairs in the UK

Supplier	Website	Notes
eSpares	espares.co.uk	Wide range, UK delivery
Partmaster	partmaster.co.uk	Bosch, LG, Samsung parts
Ransom Spares	ransomspares.co.uk	Good for seals and fans

Legal Rights in the UK

Under the Consumer Rights Act 2015 you are entitled to a repair, replacement or refund if your fridge fails within 30 days of purchase, or develops a fault within six months (assumed to be manufacturer-related). If your appliance is still under warranty, any covered faults must be repaired free of charge.

Learn more at Citizens Advice.

Summary Checklist

Step	Applies To
Check power and socket	All brands
Reset fridge (unplug 5 mins)	All brands
Exit demo mode	Samsung
Clean condenser coils	Bosch, LG
Inspect door seals	All brands
Run Smart Diagnosis	LG
Check error codes	All brands
Call technician if needed	All brands

Final Thoughts

Most fridge cooling issues—from blocked vents to an accidental demo mode—can be solved with a few checks and simple resets. If you do need a professional repair, knowing your consumer rights and where to find genuine parts puts you in control.