Question about Zanussi ZX99 / 5 Bottom Freezer Refrigerator

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Zanussi zx99 fridge fault - freeze working fine, but fridge hs stopped keeping thing cool. If we switch off and leave for 24 hours - works fine. I heard something about a pipe that allows recirc. air into the fridge can get frozen and have this impact - what do you think and how can we fix long term??

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The problem is very common full out the plastic cover inside the fridge, check the heater glass heater or allominume heater check the continuity of the said heater if ok, check the thermal fuse conecting the wire of the heater, very small thermal fuse have plastic cover, good luck god bless boss_frnd@yahoo.com

Posted on Dec 13, 2008

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Cool air from the freezer evaporator bettery is blown up into the fridge from two air ducts. If the evaporator becomes ice bound the ducts get blocked. The common fault on this appliance is the evaporator sensor failing thereby reducing the defrost period. Have a look through the grill on the evap.cover. If there is excessive ice then that is your problem.
It has been known for the defrost heater to go open circuit causing similar problems.
I would advise you get a Zanussi engineer to attend this appliance as repairing this unit is not really a DIY job.

Posted on Dec 13, 2008

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You have a defrost system problem. When you turn it off the ice melts on the cooling coils so, when you turn it back on it works.

The defrost system consists of a timer, heater, and thermo disk. Any one or all could be bad. If you want to DIY I can give you more details: ronbuice.com

Posted on Dec 12, 2008

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Freezer side works fine but refrigerator side is freezing temp stays in 20's


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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If there is no cooling at all , before we go further we must confirm the first step of confirming the compressor and gas pressure. So shut off the fridge and leave it 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 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.
If defrost timer works but frost keeps forming check while the compressor shuts check if the heaters are working, check continuity of the heaters.
So try this test from the outside and make your observations so that we come to the solution.

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Oncce the fridge was shut off and left for a while the cooling had come back . If frost is seen it is a good indication as the compressor is working with sufficient gas within.
If after about 6 hours you observe cooling it is possible that the defrost timer is faulty.
Earlier make sure that the thermostat was set to normal mode for freezer and fridge.
However if Ice forms 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.
If defrost timer works but frost keeps forming check while the compressor shuts if the heaters are working, check continuity of the heaters.
replace the defrost timer, heater or thermostat one you have confirmed to eliminate one by one.

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Many times a freezer and/or refrigerator do not work right because of a dirty condenser coil...there are also many other things that can go wrong.


If you are hearing a clicking or buzzing then check out the last two tips.

If your refrigerator is running but warm, then...

Check out these tips that I wrote about that... it is a great place to start trouble shooting your unit...and something that you can do rather then calling a repair person to do a simple thing for you...

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