Question about Miele KF7642S Bottom Freezer Refrigerator
Our Miele fridge-freezer (actually model no. KF7542SN or KF76422SN) has a no-frost
refrigerator as top section. This seems to work as follows: the cooling
part of the cycle is followed by a short defrosting period when the ice
crystals on the back of the fridge melt and the water runs down to a
horizontal collecting "ledge" 2/3 of the way down the
back wall. from there it is channelled through a small hole in the back
of the fridge to the outside where (presumably) it evaporates.
The problem is that the hole easily becomes blocked, initially only partially but enough that all the water can't run away before the next cooling cycle starts. It then freezes, further blocking the hole and impeding outflow at the next defrosting cycle. Pretty soon there is a solid block of ice constantly filling the freezing ledge and then the water runs down into the rest of the fridge and accumulates in the veg trays etc.
We have several times removed the block of ice (melting with a hairdryer) and cleaned the hole as much as can be done from inside the fridge. Initially this cured the problem for several months, especially after we raised the thermostat on the fridge to 6 degrees. More recently however, the hole seems to freeze up again after a day or two each time we clean it. Perhaps there is dirt on the back edges of the hole which we are unable to remove from inside the fridge (I'm reasonably sure that the hole is not easily accessible from the rear of the fridge either, although we haven't tried).
The Miele manual only states that the hole should be kept clean, but this is pretty clearly a design flaw which must affect all of these fridges. Perhaps they've cured it in more recent models. They have a £99 call-out fee to examine the fridge without any guarantee they will fix the problem first time or at all.
I'd be very grateful for any advice!!!
Most likely problem is NTC, which is behind cover at rear of light.You will require torx screwdriver to remove. It's the one with green markings on screwed to the back wall of the fridge. Part no.7323301 it about 35 pounds to buy
Posted on Mar 29, 2010
You require NTC for fridge evaporator. Part no.7323301. It is the one screwed to the back wall of the fridge with a green band on it.Behind the cover at the rear of the light.
Posted on May 24, 2010
Call Service. 1-800-999-1360 (US) or the Canadian number. Most likely the circulation fan and/or damper flap could be out of whack.
Posted on Jul 12, 2010
F2 indicates that there is a defrost problem. For this reason, if you turn off and defrost the fridge manually, the unit will work for a while after doing defrost.
You said that you replaced temperature sensor. What is called temperature sensor is different from the defrost thermostat, which is one of the parts involved in the fault.
If there is no defrost cycle, or if defrost is insufficient, problem is usually the defrost thermostat. The thermostat is located behind the freezer section rear wall, where the evaporator resides. To access it you need to remove frozen food and undo screws holding the back panel. The thermostat is a metal cylinder shaped object connected to two wires and clipped to the evaporator. The thermostat can be tested using a multimeter set on impedance. If reading impedance at room temp. on the thermostat contacts is infinity (circuit open),then the thermostat must be replaced. In the same way is tested the defrost heater. Check also that evaporator fan is starting.
If parts in the evaporator section are working, then the problem can be the defrost timer, which starts the defrost once every 8 hours.
Here how thermostat looks like. In same page read also the repair instructions from other users.
Posted on Jan 25, 2011
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