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its either the defrost heater or defrost thermostat or the defrost timer has gone bad and the evaporator is iced over,HINT: (you will see the inside rear panel in the freezer has frost on it) and the evaporator fan cannot blow cold air over the iced up coils in which case soon the freezer will start to seem warm too,if this isnt the case then its the damper vent door located between the freezer and fridge compartment that opens and closes to throttle cold air into the fridge from the freezer,sometimes they freeze shut from condensation or the door hinge breaks and it can jam shut,also if theres excessive water dripping into the fridge from the top it can be a plugged drain hole and water blocks cold air flow,also make sure the evaporator fan beneath the evaporator coil in the freezer is operating when the units running or cold air wont be pushed into the fridge either
Frost free fridge freezers are very popular and auto defrosting fridges are a great convenience. In a frost free appliance the cold air is blown round the freezer using a fan. On modern refrigeration the evaporator (which is the plate that gets cold) is hidden behind the plastic wall inside at the back of the food shelves. When working correctly you can usually see small beads of ice randomly scattered on the back wall unless it's in a defrost cycle when you may see water.<br />
Believe it or not most modern refrigeration has a heater inside. This heater is used to defrost the appliance automatically. During the defrosting cycle the ice on the back wall melts and runs down the back wall into a channel. It is then directed through a hole out through to the back and runs into the evaporator tray. The evaporator tray is on top of the compressor which gets pretty hot and evaporates this water into the air.<br />
Because the evaporator is behind a back panel the cold air has to be blown around the compartment with a fan motor. The defrost cycle also needs sensors and a timer and combined with several sensors throughout and PCBs to control everything the result is there is a lot more to go wrong than there used to be in old-fashioned conventional fridges. However, they are still fairly reliable.<br />
Common problems with frost free fridge freezers
If the door is left open for too long (especially in humid conditions) the evaporator freezes over and the unit will not keep the food cold. This problem (unlike the older machines) has a greater impact because you can't see the amount of ice built up around the back of the panel hiding the evaporator. In many frost free fridges the ice can form all the way round the fan and cause it to run slowly or even seize up. Prior to seizing up the fan may catch on the ice and make a high pitched noise. This will of course result in the fridge or freezer not getting cold. If you hear a strange noise from your frost free fridge freezer which sounds like something is catching on a rotating fan it could be due to ice forming around it.<br />
If it stops working due to ice forming behind the evaporator and round the fan then defrosting the unit manually can fix it but it involves unplugging the unit for at least take 12 hours or so. You may not see much frost as it would be behind the back wall or behind the fan unit. You can't really use a hair dryer on modern units because they may have a thermal fuse which protects the defrost cycle. Also, even just getting to the evaporator to defrost it can be a mammoth task especially with some of the new American-style fridges. If a fault re-occurs later it could be due to faulty sensor but if the fault was only due to the door been left open for a few hours accidentally then a total defrost could work. <br />
Whilst we are on with American style frost free fridge freezer's, because the door's are so big and can store so much, the opportunity to overload them is greater. This too causes warm air to pass into the unit and frost it up. Remember a frost free unit will not cope with too much ice on the evaporator so greater care must be taken to use it correctly and check the door seal's regularly. <br />
<b>Water or sheet of ice inside fridge</b><br />
If your fridge has two sloping channels at the back wall and a hole in the middle this is designed to channel the water created on the defrost cycle through to the back of the unit where it runs onto an evaporator tray. This tray sits on top of the compressor and gets quite hot. The water simply evaporates. Sometimes this hole gets clogged up and prevents the water running out to this tray. The result is that water runs into be base of the unit. Very often the appliance will come with small tool for cleaning out this hole, but if not you can improvise.<br />
If the water in the base of the unit is frozen solid it could be that the unit has malfunctioned and is over freezing. The blockage preventing the water running through to the evaporator tray could actually be solid ice.<br />
It's common knowledge that most people rarely read the instruction book supplied with their new appliance. This is particularly true with something like a fridge or freezer. It's easy to imagine most people thinking you only need to plug it in, leave it plugged in, and fill it with food - what's to know?<br />
I would advise anyone with a modern refrigeration appliance, especially the American-style fridge freezers, to carefully read the instruction book. Modern frost-free refrigeration units work very differently to a conventional fridge or freezer. It's even important to learn how to stack them properly otherwise you can prevent the air from circulating inside and cause warm spots.<br />
You would be surprised at what you can learn from reading the instruction book.<br />
Many <a href="http://www.washerhelp.co.uk/instruction-manuals.html">User instruction manuals</a> can be downloaded here. The page concentrates on washing machine manuals but links to appliance manufacturer sites where users such manuals for fridges, freezers and other appliances should also be available.
the evaporator coil inside the freezer compartment is iced over and can't transfer cold air in thes condition,remove panel inside freezer on back side of freezer compartment and thaw it out with a hair dryer,then check the defrost heating element for continuity,if its open replace it,if its good, ,check the defrost control that powers the defrost heater
We have the same and I think it is because the freezer door bounces open when we shut the fridge door. Then the freezer compartment ices up, the fan clogs up with ice and cannot blow cold air into the fridge, and the fridge gets warm and the milk goes off.
Solution? We have bought one of those child safety clips (search for fridge safety clip or lock) to hold the freezer door closed.
Simple design error. Expected better from Bosch :-(
If all else fails I would completely defrosted the unit.If there is any blockage this will open up all the tubes.Unplug it open the doors put pans of hot water in the freezer to speed up the process.
Make sure your fan is still working ,its located behind the freezers back wall. If it is working the vent from the freezer down to the refridgerater may be blocked.With out a fan you have no circulation but your freezer may look likes its working,it may last 3 days.Also if you can move everything out unplug it turn it off w/ doors open 12 to 24 hrs this will free up any clogged tubes. Good luck. Len West
Sounds like a defrost problem. Check to see if
there is any frost buildup in the back wall of the freezer. If so, it is not
defrosting as it should.
bad defrost timer/board
bad defrost heater (in freezer)
bad thermo switch in freezer
you don’t know what these are then unplug the machine and let the ice melt in
the freezer overnight with the door open. Then try it the next day, if is
cooling fine then you need to have a service person replace one of the above
items. If it still has a problem then it might be the compressor and you should
probably replace the machine.
Hi - experienced this myself and spent ages trying to get to the bottom of it - only found one post but it worked and was absolutely clear on the cause nb: i'm not an "expert" !
My understanding of how the Bosch f/f works is that the freezer compartment generates the cold air for the fridge which is regulared at the fridge end . At the back of my fridge there are two "vents" which feed up this cold air up from the freezer into the fridge.
Problem happened to me because I left the freezer door slightly ajar which generated a massive amount of frost (sucking in the moist air from the house I guess then freezing it) and subsequent ice froze up the cooling ducts between the freezer and the fridge. Therefore, no matter how much I turned up the fridge thermo it never got cool. Only solution was to dump my frozen at a mates house and defrost the the FREEZER for a good 24 hrs +.
Worked tho' - fridge was completely back to normal.
PS: I understand this issue may also happen if you put too much unfrozen food into the freezer at one go and in working overtime to get it frozen causing a massive frost up again.
the evaporator is probably iced up and hence poor air flow. (i am assuming it is a frost-free type). switch off and leave for 24 hours with door open is the easy cure. otherwise, remove the back inside panel of the freezer and melt off the excess ice with a hairdryer used carefully