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Where is the defrosting clock on my ZI 920/8ff (PCM 925771669) (type B257726)fridge freezer. I've checked out the defrosting heater and its ok. I need to find out where the defrosting clock is located in/on the carcase of the fridge freezer and secondly what do i remove to get at it. I teach electronics and need to know if the defrosting clock is a repairable part and if so is there a circuit diagram available? Many thanks for all your advice and help. Phillip Cantwell, Trim, Meath, Ireland.

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The defrost timers are sometimes located in the same area as the temperature controls. A cover in this area will have a round hole giving access to the clutch head screw used to actuate the timer cycle. These timers are not field serviceable and are a replacement part. The cover over the control section should be removable to access the timer for replacement.

Posted on Jul 29, 2008

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Westinghouse RJ523v, freezer cooling buy not defrosting?


Most likely going to be the defrost heater element or the defrost thermostat. Both are located behind the false back in the freezer and can be tested with a multimeter (Or just replace both if you don't have one, the parts are not too expensive). I cant recall the heater Ohm rating, but as long as it's not open circuit it is OK.
Although unlikely to be the cause, if you want to double check the control board (If the heater element and thermostat test OK), you can simply use the diagnosis mode on this model.

First, switch fridge off at the power point for at least a few minutes, press the clock button on the display to ensure there is no residual charge in the system.
Second, turn the fridge on and immediately press both "Fridge" and "Freezer" buttons simultaneously.
Move through the test modes by pressing the "Clock" button, when the screen shows "def" the heater should turn on. It will start getting hot and melt any ice, if these parts are working.

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Hi the thermostat could be the cause of your problem but check the temp of the compressor put your hand on it and it should be about room temp any hotter and this needs replacing also look on the pipes at back where they run on the outside check as much as you can and see if it has any frost on any of these pipes.
As its forming on one side then it might not be thermo but check compressor first and make sure its not running hot ok then get back to us

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1 Answer

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If there is no cooling at all on the fridge section but the freezer works then it is confirmed that the compressor and gas pressure is OK. Now shut off the fridge and leave it powered off while you clean and check the evaporator for frost. If frost is seen it is a good indication as the compressor is working with sufficient gas within.
Now after about 6 hours plug in the fridge to start. Observe cooling to happen in about one hour and ice to from under three hours.
Earlier make sure that the thermostat was set to normal mode for freezer and fridge.
However if ice forms in the freezer then observe the fridge for about 24 hours for cooling to continue and the fridge to cut off . If not the auto defrost timer, or the thermostat must be checked. Frost formation without defrosting could block the air flow and so shut the air passage to the fridge. Also the blower fan must work and if this is not working then the fan can be faulty. Also a fault on the control unit is a suspect to non functioning of any one of these components.
If defrost timer works but frost keeps forming check while the compressor shuts if the heaters are working, check continuity of the heaters.
So try this test using a multi-meter on the defrost timer and the thermostat and make your observations so that we come to the solution.

Please check the link below for tips to remove the panels/parts: http://www.espares.co.uk/advice/fridges-and-freezers/a/2

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1 Answer

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How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp

OR..
If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

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1 Answer

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How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php


The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp .

OR.
If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.


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1 Answer

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How to check parts
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp .

OR.
If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.


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2 Answers

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2 Answers

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The fridge gets its cold air from the freezer through a vent between the freezer and fridge.The fan in the freezer blows air through it. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp

..
If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

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1 Answer

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