A faulty fridge freezer is a genuine household emergency. Unlike other kitchen appliances where a breakdown is just an inconvenience, a cooling failure puts hundreds of pounds worth of fresh and frozen food at immediate risk of spoiling.
Because modern refrigeration relies on a complex, sealed chemical network, delicate temperature sensors, and automatic defrost systems, locating the exact cause of a cooling problem takes professional expertise.
Below, we cover the five most common fridge freezer problems homeowners face and look at exactly how a professional refrigeration engineer safely diagnoses and resolves them.
1. The Fridge or Freezer Is Not Cooling Enough
What you experience: The interior lights are on and you can hear a faint hum, but the butter is soft, milk is souring quickly, or items in the freezer are beginning to thaw.
How We Solve This:
- Testing the Thermistor (Temperature Sensor)
- The appliance relies on small electronic sensors called thermistors to monitor internal temperatures. If a sensor fails or sends the wrong reading to the control board, the system won’t activate the cooling cycle. We will measure the sensor’s resistance to see if it needs replacing.
- The appliance relies on small electronic sensors called thermistors to monitor internal temperatures. If a sensor fails or sends the wrong reading to the control board, the system won’t activate the cooling cycle. We will measure the sensor’s resistance to see if it needs replacing.
- Checking the Condenser Coils and Fan
- Heavy layers of household dust or pet hair on the external condenser coils (located at the back or underneath the unit) block heat from escaping. We will inspect and clean these coils and verify that the condenser fan motor is spinning freely to dissipate heat.
- Heavy layers of household dust or pet hair on the external condenser coils (located at the back or underneath the unit) block heat from escaping. We will inspect and clean these coils and verify that the condenser fan motor is spinning freely to dissipate heat.
- Diagnosing the Compressor
- The compressor is the heart of the refrigeration cycle. We will check its electrical start relay and windings. If the compressor hums loudly but fails to pump, or cuts out after a few seconds, we will diagnose the structural health of the cooling system.
2. The Freezer Is Excessively Icing Up (Frost-Free Failure)
What you experience: Even though you have a “Frost-Free” model, thick blocks of snow and ice are building up around the freezer drawers or blocking the internal air vents.
How We Solve This:
- Testing the Auto-Defrost Element
- Frost-free appliances use a hidden heating element wrapped around the cooling coils to melt away frost build-up automatically a few times a day. If this element burns out, ice will accumulate until it completely chokes off the airflow. We will test the element’s electrical continuity.
- Frost-free appliances use a hidden heating element wrapped around the cooling coils to melt away frost build-up automatically a few times a day. If this element burns out, ice will accumulate until it completely chokes off the airflow. We will test the element’s electrical continuity.
- Checking the Defrost Thermostat and Timer
- If the heater is fine, the fault may lie with the defrost timer or bimetal thermostat that tells the heater when to switch on. We will bypass the control circuit to isolate the failure and replace the faulty component.
- If the heater is fine, the fault may lie with the defrost timer or bimetal thermostat that tells the heater when to switch on. We will bypass the control circuit to isolate the failure and replace the faulty component.
- Inspecting Evaporator Fan
- If ice blocks the internal evaporator fan, air cannot be circulated into the fridge section, often leading to a freezing freezer but a warm fridge. We will access if there is a faulty fan or a faulty temperature sensor and replace the faulty component as necessary.
3. Water Is Pooling at the Bottom of the Fridge
What you experience: You constantly find a puddle of fresh water collecting underneath the salad crisper drawers or slowly dripping out from the front door onto your kitchen floor.
How We Solve This:
- Clearing a Blocked Defrost Drain
- During normal operation, condensation on the back wall of a fridge drains down into a small plastic trough and exits through a tiny hole. If food debris, mould, or lint blocks this hole, water overflows straight into the bottom of the fridge area. We will flush the drainage canal and clear the blockage.
- During normal operation, condensation on the back wall of a fridge drains down into a small plastic trough and exits through a tiny hole. If food debris, mould, or lint blocks this hole, water overflows straight into the bottom of the fridge area. We will flush the drainage canal and clear the blockage.
- Checking the Drain Evaporator Pan
- The water should drain into a shallow plastic pan sitting on top of the warm compressor at the back, where it evaporates naturally. We will check this pan for cracks, misalignments, or structural damage that could cause external leaking.
4. The Appliance Is Running Constantly or Is Very Noisy
What you experience: The appliance never seems to turn off, running its motor twenty-four hours a day, or it makes an annoying buzzing, rattling, or high-pitched vibrating sound.
How We Solve This:
- Checking the Door Seals (Gaskets)
- If the magnetic rubber door seals are split, warped, or losing their suction, warm room air will constantly leak inside. This forces the appliance to run non-stop to keep up. We will test the door seal integrity and replace any worn/perished gaskets.
- If the magnetic rubber door seals are split, warped, or losing their suction, warm room air will constantly leak inside. This forces the appliance to run non-stop to keep up. We will test the door seal integrity and replace any worn/perished gaskets.
- Inspecting Fan Blade Obstructions
- A loud clicking or whirring noise that stops when you open the door often means an internal fan blade is physically striking ice accumulation on the cooling coils. We will remove the interior panels to clear the ice and realign the fan assembly.
- A loud clicking or whirring noise that stops when you open the door often means an internal fan blade is physically striking ice accumulation on the cooling coils. We will remove the interior panels to clear the ice and realign the fan assembly.
- Levelling the Appliance
- If the compressor mounts have worn out or the fridge legs are unlevel, structural vibrations will echo loudly through your kitchen floorboards.
5. The Internal Lights work, but the Machine Is Completely Silent
What you experience: Open the door and the light switches on, but there is absolutely no sound of life, no cooling, and the compressor is completely cold to the touch.
How We Solve This:
- Testing the Main Control Board
- The printed circuit board (PCB) manages the cooling cycles. If a power surge has damaged the board or a relay switch has burnt out, it won’t send electricity to the compressor or fans. We will test for voltage output from the board.
- The printed circuit board (PCB) manages the cooling cycles. If a power surge has damaged the board or a relay switch has burnt out, it won’t send electricity to the compressor or fans. We will test for voltage output from the board.
- Checking the Overload Protector
- To protect the motor from burning out during voltage drops, compressors have an overload protector. We will check if this safety device has permanently blown or tripped, cutting off power to the machine’s primary components.
⚠️ Leave Refrigeration to the Experts
Refrigeration systems are pressurised networks containing specialised chemical refrigerants. Handling these systems requires specialist environmental certifications and training. Attempting a DIY fix on electrical components, cutting into internal panels, or piercing the cooling coils can result in dangerous gas leaks, fire risks, or immediate, permanent destruction of the appliance. Always call an experienced professional engineer.