fridge freezer refrigeration capacitor testing and replacement

⚠️ SAFETY MESSAGE: Always disconnect the appliance from the mains power supply before attempting any inspection or repair. Capacitors store electrical energy and can deliver a sharp shock even when the unit is unplugged. If you are unsure, consult a qualified engineer.

Testing Fridge Freezer Refrigeration Capacitors 🧊

A refrigeration capacitor is a small but vital component usually found near the compressor. Its job is to provide the electrical "boost" needed to start the heavy motor (Start Capacitor) or to help it run more efficiently (Run Capacitor). If this component fails, your compressor may hum, click, or refuse to start entirely.

Let's explore how to diagnose this together. I’ll ask guiding questions along the way to help you through the process. 🛠️

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Types of Fridge Capacitors ⚙️

Type	Function
Start Capacitor 🚀	Provides a high-torque "kick" to get the compressor motor spinning from a standstill.
Run Capacitor 🏃	Stays in the circuit to improve motor efficiency and power factor while the fridge is cooling.

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Easy test but can be slightly difficult to access wires , you need to remove the plastic wire covers and access the relay , find the capacitor wires and remove one as it might affect reading. use meter probes to contact the 2 caspacitor wires and test wth meter set to capacitance . The reading should be 5% + or - the rated capacitance. This one was a 2.5mF so 2.37mF lowest the reading i got is 2.32mF close to needing repalcement so i will replace it with a new one.

If the capacitor is faulty the compressor will be less efficient , it may start intermittently or not at all in which case all you will here is a hum and the fridge freezer unit will not get cold.

See video of this entire process below 

Testing fridge freezer refrigeration capacitor - YouTube

Visual and Physical Inspection 🔍

Before we use a multimeter, we should look for obvious signs of failure. In the spirit of "scuttlebutt" reporting, we can often see or hear a problem before we measure it.

If a capacitor has failed internally, the pressure inside can build up. When you look at the component, if you see that the top is bulging or if there is any oily fluid leaking from the terminals, the part is definitely faulty.

If the capacitor looks physically perfect but the compressor is making a repetitive clicking sound every few minutes, what do you think that sound suggests the compressor is trying (and failing) to do? 🕵️‍♂️