Help on Fridge with ice box freestanding or integrated

by / Sunday, 25 September 2016 / Published in Fridge & Freezer




How to find faults and repair a fridge

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Fridge Freezer Thermostats

 

 

 

This article will show you how a conventional fridge with an ice box works. We will be looking at the cycle of the fridge over a few days with our graphing system where the data is supplied by our unique fridge test equipment which will be available later in the year.
I will be explaining how to fridge cycle Works and how the areas within the fridge stay cold, we will also look at the common faults and how to rectify them.

Common faults

If all your food in the fridge is getting too cold and the drinks are freezing then this may be a thermostat problem.
If the fridge is not getting cold you need to check if the compressor is running,
If the compressor is not running then it is normally one of 3 faults.
1. Thermostat failure
2. Starter relay failure
3. The motor has gone open circuit.
If the motor is running then you may have a gas leak problem.
There is not enough gas in the system for the refrigeration cycle to take place, or the compressor is not pumping the gas around the refrigeration circuit this can be due to a weak compressor, or a blockage in the system (sometimes the dryers block)

Notes on compressors

Compressor Running:
The compressor is a motor which pumps gas around the circuit, you can tell when a compressor is running because they get warm and you can hear it running if you listen closely. They have a starter relay on them which shuts the compressor into life, they also have an overload relay this is designed to protect the motor, Both of these can sometimes go faulty and need to be tested you can see our other videos on these.

Compressor Not Running:

The compressor may be cold and you will not be able to hear a noise apart from.
When a compressor is not running you may here a clicking noise every few minutes this may be the overload sensor cutting out due to a faulty starter relay or compressor.
A useful technique is using a screwdriver, placing the pointy end on to the motor of the compressor and the handle to your ear you may hear a humming noise this will be the windings as the motor is trying to start.

You can test compressors 

fridge-compressor-pins-to-test

It's a good idea to verify that the compressor is OK: Use a multi-meter (make sure fridge is unplugged!) and check resistance across each pair of pins on the compressor itself (3 combinations total). Two of your readings should be smaller than the third (the two have the same resistance on my fridge), and the third should be total of the two (see diagram, R-S goes through C). For example: S to C 4 ohm, R to C 4 ohm, R to S 8 ohm. If it is significantly off from this sum-total rule, you're probably have to get a new compressor as the windings are not good. You should also check that the windings are not shorted to chassis (either of the three pins should not go to chassis which is the earth)

Thermostats can go open circuit or not cycle at the correct temperature range

refrigerator-overload-thermal-protector-relay-starter

over load sensors can go open circuit due to by-metal strip failing

an-example-of-a-start-relay

Starter relays come in many shapes and sizes and fail often

24h technical help answers

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