Coil in freezer icing up and auto defrost not working.the heat strip at bottom of coil is not going on and ice build up on coil cuts cold air supply to refigerated side of refrigerator.is there a sensor...
fridge is probably suffering from a defrost circuit failure. One (or
possibly more) of the following components has failed: 1) the defrost
terminator or sensor, 2) the defrost heating element or 3) the defrost
controller / timer. Items 1 & 2 should be found in the freezer
compartment - behind the back wall. The 3rd item can often be found in
the toe space at the bottom of the fridge - behind a kick plate or some other relatively accessible location.
The operation is as follows: The defrost timer runs constantly and about every 8 hours or so, it switches the power from the compressor and its associated controls (fresh food compartment t-stat, etc.) to the defrost circuit that consists of a heating element and a device called a defrost terminator. Power is applied for about 15 to 20 minutes during which time the defrost heater is energized IF the defrost terminator detects the evaporator coil compartment temperature is cold. When the defrost terminator detects that the heater has warmed the evaporator coil compartment to a temperature of about 50 degrees OR the timer has powered the defrost circuit for 15 to 20 minutes, the defrost circuit / heater de-enrgizes. Even if the heater is hasn't reached 50 degrees in the 15 -20 minutes, the timer switches from the defrost circuit back to the compressor through its controls once again. You'll need to determine if 1) the timer is timing, 2) the timer switch can actually send power to the defrost circuit, 3) the defrost terminator can close when cold - or if it is stuck open, or 4) the heater works.
If you don't know how
to work with electrical meters and tools or are not comfortable working
in tight spaces (back wall of the freezer) with live electric parts, you
should call a repair person. Also, refrigerants are very dangerous.
If allowed to escape from the tubing, coils, etc. there is a very real
danger of instant frostbite if it comes in contact with your skin. You
can be blinded if it contacts your eyes. These above reasons make me believe
that this is a pretty complicated DIY type job and really isn't a good one for a
beginner to attempt. On the plus side, parts are
relatively inexpensive, and a qualified person should be able to quickly
diagnose the problem. Labor rates and standard parts markup can bring this
repair up into $200 and up range, however.
If / when you do
call for service, having the freezer emptied & defrosted already -
will save the cost of defrosting time by the repair person.
I hope this was helpful and good luck. Please rate my
reply. Thank you.
Apr 08, 2011 |
Amana ARS266ZB Side by Side Refrigerator