We have an AEG Santo 2500i fridge. It is at least 12 years old. It is a built-in, rather small model compared to most North American fridges. Ice builds up on the back wall of the fridge. Within about a month it becomes 2-3" thick and continues to grow, almost like a glacier. This is especially bad in the summer. It eventually forces the shelves forward so that the fridge door won't close. Food at the back of the fridge freezes. So every month or so we have to empty the fridge, turn it off and defrost.
The fridge is over top of a AEG freezer, which generally runs fine.
Hi chris
dave here hope i can help
I would test the defrost timer, defrost heater or defrost limit switch
TESTING AND REPLACING THE DEFROST TIMER
This timer activates the heater that melts frost in the evaporator for 10 to 20 minutes every 10 to 12 hours. In the process, it turns the compressor off and on. If it fails, the compressor may not run. Or the heater may not go on, eventually causing a hidden ice buildup that blocks the cold-air flow and disables the evaporator fan. An access hole lets you test the timer. If the timer isn't in the control panel, look behind the front grille or behind the rear access panel. If the compressor fails to run turn the timer until it clicks. If compressor goes on, timer is faulty. If unit isn't defrosting automatically and turning timer stops compressor or fan, timer is faulty.
Before replacing timer, spray it with electrical contact cleaner through access hole and turn it a few times. Stop just before a click and wait to see if timer advances on its own.
To replace timer, unplug the refrigerator and open control panel. Remove screws holding timer to panel and pull of leads. If wires aren't in a plug, move then one at a time to new timer.
EVAPORATOR AND DEFROST HEATER
In a frost-free unit, the evaporator coils, their fan, and the deforst heater are located behind the freezer's back wall or under its floor. The fan, which circulates cold air between the coils and the two food compartments, is controlled by the door switch, the thermostat, or both. To check the fan, open both doors, wait for the compressor to go on, and hold in the door switch. If you can't hear the fan running, test the fan(below).
The defrost heater, which melts frost on the coils, is cycled on by the defrost timer(above). If the frost melts before the end of the defrost cycle, the defrost limit switch turns the heater off. The heater may be a metal rod, a wire wrapped in foil, or a coil inside a glass tube. All are tested the same way. Test terminals for the heater are often located in the control panel or under a doorjamb; check the wiring diagram. Or test the heater leads inside the evaporator compartment.
TESTING THE EVAPORATOR FAN
To remove the evaporator fan, unplug unit; open back panel(or floor) of freezer. Then unscrew housing holding fan, and take off leads going to fan motor. With VOM(Volt-Ohm Meter) on RX1, probe motor terminals(except green ground wire terminal). Look for moderate resistance(50 to 200 ohms). Replace fan if much lower or infinity.
TESTING THE DEFROST HEATER
Open control panel. With VOM on RX1, probe test terminals. Look for 15-to 100-ohm reading. If infinity, turn defrost timer(as above); retest.
TESTING DEFROST LIMIT SWITCH
Trace and disconnect leads. With VOM on RX1, probe leads. Look for infinity reading when switch is warm, zero after 20 minutes in working freezer.
Hope this sources your problem
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Defected DEFROST HEATER can cause frost build up on the panel at the back of the freezer,and freezer stop cooling and ice frozen on unit so air could not flow to refrigerator side.You must change this defroster heater assembly so it will works normal again..
hope this may help;
Heavy Frost on the Coils
This is good! This indicates a defrosting system failure which is a simple
control problem. It also means that the sealed system (compressor, evaporator
coil, and all associated tubing) is fine as wine in summertime. Defrost system
problems are easy fixes that anyone with a pulse can do with maybe just a little help from their
friends. The problem will either be the defrost timer (or Adaptive Defrost Control board, if so equipped), the defrost thermostat, or the defrost heater. To locate these parts in your fridge, check
out these cool, interactive parts diagrams.
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There's really something wrong with it if it freezes that fast, Is there a control to adjust the temperature of it?
Empty space in a refrigerator or freezer is generally a bad idea...and often causes the refrigeration to cycle more often. Having it filled with things is much better, since the thermal inertia of the stuff will help keep it colder and more stable temperature wise. Also the less room for air there is, the less problems you'll have with condensation.
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U need to defrest the frize
Hi,
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The first response I got was to "defrest the frize". I'm assuming that means defrost the fridge- which is quite obvious and what we have been having to do too often. My question is whether there is a problem with the fridge that is causing this ice to build up so quickly. I was hoping for more clear and helpful advice than this. Anyone?
Yes, there is a temp control in the fridge. It does not seem to matter where it is set, the problem still persists.
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