How the Bosch kgu34665gb/01 Fridge Freezer works and common faults and parts

by / Wednesday, 28 September 2016 / Published in

How to find faults and repair a Bosch kgu34665gb/01 Fridge Freezer


Bosch kgu34665gb/01 Silver Fridge Freezer



Bosch Fridge Freezer Spare Parts

Bosch Fridge Freezer Spare Parts




This article will show you how a Bosch kgu34665gb/01 Fridge Freezer. 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 your Bosch kgu34665gb/01 Fridge Freezer 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

The fridge compartment maybe getting warm,
on a single compressor frost-free fridge freezers this may be an air flow problem coming from the freezer due to heavy ice build-up on The Matrix this may be due to the freezer not defrosting correctly this can be a faulty element or ntc sensor a faulty circuit board one of the heater cut outs are not working correctly and therefore not letting the defrost take place,

  1. Things to check do a test
  2. Heating element
  3. NTC sensors
  4. Fan motor
  5. Safety cut outs for heater
  6. Clear air flow passages

If all your food in the fridge is getting too cold and the drinks are freezing then this may be a thermostatic 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. thermostatic failure ntc sensor or pcb
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 


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 7 ohm, R to C  ohm, R to S 14 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)


Other things to check
Door seal/s faulty or not sealing allowing moist air into fridge or freezer may be causing excess ice build up
Gas Faults
Basically this is pretty much an engineer’s area, but the causes are as follows in the main:
Shortage of gas on appliances under a year old or have just been moved
Blockage or choke in pipework
Changeover valve faulty
Compressor pumping weak (highly likely on older machines 8 years or older)

Bosch Fridge Freezer Spare Parts

Bosch kgu34665gb/01 Fridge Freezer





bosch KGU34665GB/01 Ntc Sensor


Bosch kgu34665gb/01 Fridge Freezer fan motor


kgu34665 on of the starter relays fitted



kgu34665gb/01 Fridge Freezer seal


7 Responses to “How the Bosch kgu34665gb/01 Fridge Freezer works and common faults and parts”

  1. Sue Shields says : Reply

    I am worried about my Bosch Exxel fridge freezer which I bought about 10 years ago in a department store which has now closed.
    The front section above the freezer door is quite hot.
    Can you advise me of anyone in the Cardiff area who can have a look at it. It has been a fantastic fridge – no trouble before.

    • Jane, Upminster says : Reply

      Sue, what was the outcome of your problem as exactly the same is happening with my fridge freezer and it is 11 years old? Is it dangerous?

  2. Martyn says : Reply

    I have a Bosch freestanding f/freezer in my garage and for the last few months during the hot weather the fridge compartment has been freezing up, and freezing food. It is set to 4c but due to ice build up on the rear panel of the fridge, the temperature display will indicate at 0c.
    I then switched of the fridge compartment and the fridge remains at 0c.
    Seems like the freezer compartment is causing the fridge to drop below 4c.
    Freezer is set and indicating -18c on the display.
    What could be the cause of the amnomily?

  3. Annie Tait says : Reply

    I have a Bosch No Frost fridge/freezer and noticed water on the kitchen floor. When I pulled my appliance away from the wall the condensation plastic tray at the back was full the the rim. I soaked up the water with kitchen roll but this morning it was filling up again. What can I do? The fridge in about 6 years old.

  4. Richard Shearing says : Reply

    The fridge light of this ExxCel fridge freezer no longer works, There is an LED card but it may be the door switch which is not working?
    Please advise?

  5. MATT SUESSE says : Reply

    Hi, i went clean the rear of the Free-standing fridge-freezer KGH36X50GB and i have pulled out the spade connectors from the compressor switch and have no idea which wires go where , i also cant find any wiring diagrams online.

  6. Chris says : Reply

    Hi, got a Bosch Exxcel Fridgefreezer. Problem with the fridge underperforming. Massive build-up of ice in upper section of the freezer. Now fully defrosted (thanks to the suggestion of using a wall paper steamer to speed up the process) so hopefully resolved. The unit in this area is quite complex looking, lots of pipes and silver steel. If I have to replace the fan behind that unit please can you advise how I remove the complex looking chiller thing without breaking the copper pipe that presumably feeds it with gas? Sorry one last question, if I get a buildup of Ice again in this area could you kindly advise which part could be faulty. Thank you in advance for taking the time to reply 👍

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