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-20C is about the right level for a three-star freezer.
Domestic freezers have a star rating indicating the temperature they are designed to operate at. On the packaging of a frozen food there is guidance stating how long the food can be stored using freezers of a given star rating. As a guide here are some suggested maximum storage times at -18°C for a variety of foods."
Service engeener always checks the average temperature inside freezer or refrigerator compartment. When you turn on freezer, the compressor starts to circulate gas through the system and the temperature in the freezer is decreasing (go to minus). When inside of the freezer reaches the set temperature the compressor is switched off and temperature will increasing. What will be the difference of inside temperature depends on the type of refrigerator and type of thermostat or sensor and moves to max. 8-9 degrees. With the advent of new "No Frost" refrigerator, this difference was reduced to only a few degrees Celsius, thanks to the fan inside the refrigerator and NTC sensor.
So 29 + 14 = 43; 43/2 = 21.5 which means that your average temperature of -21.5 which is not too much deviation from the set temperature of -18 and I think that is ok.
Hi Julie. I'm Roger. It sounds like the operating thermostat is not working When not in the fast freeze mode. Can you here a click sound from the thermostat when turning the temperature up and down short of fast freeze? We normally charge them to operate at -10 to -20 degrees. The inside temperature will normally only reach a temperature around 18 degrees warmer. The operating thermostat should allow you to regulate its temperature any where from that capability up to where you want it. See if your thermostat makes a clicking sound when adjusted. The warning light comes on because it knows the box temperature is higher than it is set for and is warning you of that. If it uses a printed circuit (PC) board, the click will dot be very loud. listen closely. Let us know how this turns out for you. We have very good refrigeration techs. here. Someone else here may have an idea too.
From what I read, the "L." that you see on the control panel indicated that the controls have been locked. According to the manual if you hold down the "alarm reset" button for 3 seconds the "L." will disappear allowing you to control the temperature again. I don't as of yet know what is causing your overall problem though...
If the defrost timer sticks in the defrost mode,yes. Normal defrost time is 30 minutes or less depending upon which timer is installed. If it happens again,locate the defrost timer and turn the dial manually to see if the compressor comes back on. If so,replace the timer. It is probably on the rear near the compressor. Some are under the front behind the dust guard.
It depends on the control that your freezer utilizes.
If your temp control dial has the numbers 0-9 or 1-9, then you have whats commonly known as a coil temp sensor.
Unlike an air temp contol that measure the air temp inside the freezer and comes on and off with a 3-5° swing, the coil temp sensor runs a little bit different.
With a coil temp control or sensor, the temp control has a capillary tube and bulb that is inserted into the coil either at on of the ends down a guidetube or just into the center of the radiator type fins. This temp control measures the temperature of the coil, and not the temperature of the air inside the freezer. When the unit runs, the coils typically gets 20° colder than the air temp. And when the control satisfies (shuts off), it will not call for cooling again until the sensing bulb has reached the cut-in point which is typically well above design box temp.
So, to quickly answer your question, yes it is possible to have a 25° temp swing and not have anything really wrong with the unit. That is how its been designed to operate and that is how it will operate. Your only option (although not recommended) is to replace the coil temp sensor with and air temp control. That will give you more consistent temps.
Also, when taking temp of a freezer with a coil temp sensor, be sure to temp the product in the freezer and not the air temperature.
the users manual does not cover this particular issue as to the temperature swing. I have seen some thermostats that are the "constant on" type that you are describing. No way of telling from the vague manual. As long as you are not storing ice cream for a long period of time, 0 degrees is usually fine for most home applications. Sorry I can not give you more info.
I have an upright freezer which temp was unstable. The coils were frosted up, and the circulating fan was unable to pull air across the cooling fins.I defrosted the unit, cleaned it up, and turned it back on. Worked fine until it frosted up again. The unit was a no frost model. I had to have it serviced, and one of the defrost sensors was bad. No problems since this was fixed.