Question about Nor-Lake KLF7766C Commercial Freezer

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My defrost timer was replaced by a brand new one, two days ago -- the defrost light turns on for 1 minute, another few moments after, the green light turns back on again.. my temp wont go down and I am not low on charge

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Dennis Boxerman

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  • Nor-Lake Master
  • 1,305 Answers

Sounds like a bad defrost terminator or timer wired wrong. won't make temp as the evap is not clear of ice/frost build up. check your wiring diagram for location and operation of terminator.

Posted on Jun 26, 2017

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2 Answers

There is a light in my freezer. but, it doesn't get cold
Hello;

My name is Peter. I am a retired field service refrigeration technician.

You are locked into the defrost mode. This is where every 8-10 hours your unit will completely shut down except for the lights. At this time your defrost heater turns on for 20-30 minutes to defrost the evaporator (Cooling) coils in your freezer.


You can manually turn your unit back on, until you get a new defrost timer. If you have a up right freezer your defrost timer is in the lower back. It is mounted on a metal plate.

With a flat head screw driver turn the stem slowly one click at a time until your unit turns on. Once a day repeat this process to put your unit back into defrost until the timer is replaced.



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If you have a top freezer the defrost timer is located on the top of the fresh food section on the left. Do the same thing. The cost of the timer is about $30.00.

Send me your model number located on the side front wall of your fresh food section and I will proved you with the part number and walk you through the repair.

Feb 19, 2015 | Freezers

2 Answers

The freezer is running, and the light is all coming on but it is not freezing the contents in the freezer?
Hi and welcome to FixYa. I am Kelly
If your sure the compressor is running and it is not freezing then there has to be a system coolant leak.
Having said that there are a few things to check:
1. Is the compressor in fact running Y / N
a. Yes = coolant level problem or coolant system blockage
b. Not running = (Possibilites below)
1) PTC / Klixon Thermal overload failure
2) Run capacitor failure
3) Temp control failure
4) Automatic defrost thermostat or thermistor
5) Defrost timer or Adaptive defrost control failure (depending on model)
2. Is the compressor very hot to the touch or room temp?
a. VERY hot = unplug the unit for at least 30 minutes and then plug it back in.
b. ROOM temp = any of the above in 1b items 1) - 5)
3. Is the evaporator fan running?
a. Yes = Temp control is ok Defrost system is probably ok
b. No = same as 2b

With a model number I could pass on a few additional things to do. For the moment use the above.

Thanks for choosing FixYa,

Kelly

Oct 18, 2010 | Kenmore 20.3 cu. ft. / 575 liter Upright...

1 Answer

I don't have an owners manual and want to know where I should set the freezer to avoid unnecessary ice build-up. Also is there a setting for defrost?
Click Here for your user manual=> MQU1556AEW.pdf The settings for defrost should come automatically every 12 hours. You may test the defrost timer that appears to be behind the kick plate at base and front bottom of refrigerator by removing the kick plate first and using a flathead screwdriver turn slowly clockwise until compressor stops. After a few minutes you should be able to hear a crackling noise or sizzle by opening the door and listening. Leave the timer like that for up to 35 minutes and if the freezer does not start on its own the the timer is not working properly and will need replaced. Click Here=> MQU1556AEW Unit parts number 15 in photo is defrost timer. The defrost timer is part number=> 4357124 Defrost Timer Check for air leaks around door seal as this will cause the same symptoms. If by chance the defrost timer works and the defrost does not then let me know here or here=> Appliance 911 The only other parts are the defrost heater number 16 in photo MQU1556AEW Unit Parts and part number for defrost heater is Click Here=> 8201749 If you change the defrost heater it is always good to replace the defrost thermostat number 18 in MQU1556AEW Unit Parts The defrost thermostat is part number=> 1-81801-001 The most likely problem is the defrost timer but I needed to cover every possibility. If you have questions please feel free to ask, Thanks, Sea Breeze

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Oct 10, 2010 | Maytag 15 cu. ft. / 425 liter Upright...

1 Answer

Ok we have a kenmore upright freezer Model # 253.26062103. We got it brand new about 3-4 years ago. It was working fine til about 2 weeks ago when the ice cream became soft and high temp alarm started...
i had the same problem and it turned out to be the sensor, a $15 part. it pretty much controls everything related to defrosting.

Aug 05, 2010 | Kenmore 20.3 cu. ft. / 575 liter Upright...

1 Answer

Freezer defrost cycle
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.

Feb 24, 2010 | Frigidaire 20 cu. ft. / 566 liter Upright...

1 Answer

Refrigerator is not cooling
Good day,
You will need an ohm meter to check the parts.
Your defrost system has failed.
It is made up of 3 components, 2 of which are located behind the rear panel in the freezer compartment.
Remove the rear panel. There is a cooling coil, that has a calrod heating element that runs along it's bottom. As well there is a defrost thermostat ( a small round 1" disk) which is located on the top of the same coil. Both should be checked with an ohm meter to test for continuity. The heater should read no more than 30 ohms, the thermostat ( IT MUST STILL BE COLD BELOW 30 DEGREES) should read zero ohms. Note: The heater rarely fails, the thermostat has a high failure rate.

The third item is a timer, or a solid state adaptive defrost control. Depending on age, and model, it is located , behind the kick plate on the bottom front.
Or, in the fresh food compartment on the roof.
If it is a timer, you can turn the timer shaft when the machine is running until the machine shuts off. With it still turned on, wait 40 minutes.
If the machine turns itself back on, the timer is O.K. if not, the timer is bad, and needs replaced.
If the Main heater checks O.K. and it has a solid state control, then replace the thermostat in the freezer compartment, and the solid state board.

Below is an excellant tutorial on defrost systems.

http://www.appliance411.com/faq/howdefrostworks.shtml
Thank you for using FixYa

Jan 20, 2010 | Nor-Lake Freezer Norlake Refrigeration 6'...

1 Answer

I own a Frigidaire Upright Freezer/not freezing...
Good day,
If the unit is running but not cooling then check the following.
1. The fan motor behind the rear panel is not running, you will have to remove the panel, being careful not to damage the control thermostat, and inspect the motor, and replace if needed.
2. The defrost system has failed, icing the coil behind that same panel, and not circulating air. There are 3 parts to the defrost system, the main heater, a calrod unit mounted on the bottom of the cooling coil, a defrost control thermostat which is located on that same coil, but on the top. It is a small 1" round disk with 2 wires coming out of it.
Lastly, a timer which is located on the back of the machine and determines how often the unit defrosts.
If you have an ohm meter and know how to use it, you can test the heater and control thermostat for continuety if the coil is indeed iced up. If not iced up, the test will not work.

To test the timer, you take a screwdriver and with the machine on, turn the shaft clockwise until it shuts off. wait 35 minutes. If it turns the machine back on, it's O.K. If not, it needs replaced.
A tutorial on defrost systems is at the end of this post.

3. If none of the above work, then it is in the compressor/sealed system. This machine has had many issues in this area and is a serious problem unless...........
The unit is under 5 years of age, then warranty will cover the repair.

http://www.appliance411.com/faq/howdefrostworks.shtml


Thank you for using FixYa

Jan 14, 2010 | Frigidaire Freezers

1 Answer

Not recovering
Make sure the fan in the freezer is running circulating the air.
How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php

If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

Sep 03, 2009 | Freezers

1 Answer

Freezer not defrosting between cycles
Check the defrost timer for operation if your unit has one. Some Delfield models have solid state controls. If your system has a timer for the defrost you can open the timer cover and turn the dial in the direction indicated by the arrow until a time peg comes up to the time of day marker. You will hear a loud click and the compressor will shut off. Defrost should take place. The inner dial of the timer will have some indication as to how long in minutes the defrost should take. If the pointer does not move while in the defrost position the timer motor is bad. Turn the dial again so the copper pointer goes past the time of day marker and the compressor should restart. Replace the timer.

Jul 04, 2008 | Delfield 113.28 cu. ft. Commercial Freezer...

1 Answer

Freezer door not sealing
Probably a defective defrost timer. Try to find the timer. It is usually underneat in the back. When you find it turn the knob slowly click by click. (You may need a screwdriver or knife) turn just until the compressor stops. Let it stay in defrost for about 1/2 hour. turn the knob until the compressor starts let it cool down several hours. Then do it again. If this solves the problem replace the timer. While you are waiting to do this Defrost it at least twice a day by turning the knob.

Jun 30, 2008 | Freezers

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